Matirin means to let Mhalir use his body. The point of doing this is for Mhalir and it is not a gift to Mhalir, right now, to make him once again a prisoner. There is certainly a thread of thought that observes quite calmly that Mhalir put hundreds of thousands of people through that, deliberately, for years, screaming helplessly in their own heads, thrashing desperately for control of one limb or one breath they could use to warn someone. But - but that thread of thought has a core, and the core is that it is an awful thing to do, an awful thing not given less weight by all the times it has been done which were much worse than this. And the thread of thought is not very central. It did not motivate this.
What motivated this was politics. If Leareth is not satisfied with the immortality method that Cayaldwin and Mhalir come up with then he will demand Matirin tell the Andalites they cannot have Mhalir. They will be furious. They are in the process of sense-making, of the war, in the process of carefully distinguishing Yeerks as individual moral actors in the first place, it's important and Matirin has thrown himself at encouraging it, and it is a process the natural output of which is a hatred of Mhalir, personally, individually, in more depth than they hated him before. Before he was the symbol of an alien and universal thing, a monster king of monsters, evil because the thing that he was is evil. Now, there are good Yeerks, there are Yeerks they are supposed to embrace as innocent victims, as bystanders. They are supposed, perhaps, to believe that that is most Yeerks, weak young innocents who do not wish to enslave worlds, and who were nonetheless set to it by people like Mhalir, who told them that their promised day would come as long as they enslaved five billion people first.
Matirin has done that. Matched his pace to that of a troubled young soldier, let his flank brush against theirs, let his voice contain an anguish that is useful more than it is deeply felt. Told them, none of us wish to do this. You are not alone, in wishing that you did not need to do this. It is not weakness, to have in you the Andalite spirit that yearns for beauty and invention and discovery and generosity, and not for endless war. But we can buy that for our children, by winning, and we can lose it for everything in the universe, by failing. Matirin did not, in the end, order any of them to kill five billion people. But if he had, he does not think that it would have made it forgivable, that he spoke to them of a distant better world. He thinks that it would have been unforgivable and he would have died for it and it would have been right - not right - less wrong than anything else, at this point.
He resents it, maybe, slightly, that of all the places to throw himself at repairing the damage wrought by this war he has been told to throw it at saving Mhalir. It is not really that he thinks Mhalir deserves to die. It is that it will cost so much, and he has so little, and he is so tired, and he does not believe it, not at all, that it would have been right, or worth it, to enslave five billion people, no matter what the Andalites were. The Andalites were prepared to do terrible things in this war but - for the whole galaxy, which they believed to be at stake. It would be monstrous, if they'd done all that only to save themselves. He would never even have considered it, if the peoples and stories and legends and memories and ambitions of his own world were the only ones at stake. He would have grieved. He would have been terrified. He would have been furious. He would not have destroyed Earth. Not for everyone he knew and everything they would ever have the potential to do, not for all the things they would ever have had the chance to build - if those alone had been the stakes he would not have done it.
It looks to him, based on the choices made in the war, like Mhalir would have. That is to say - of course on some level Matirin is guilty of looking at a fight with a terrible symmetry to it and declaring his side's escalations intrinsically reasonable and the other side's intrinsically despicable, Matirin has definitely noticed his mind inclined to do some of that, but also the Andalites believed they were fighting not just for their own survival but for the fate of the entire galaxy, and they had the genuine strength as a people - he does think it's a strength - to be a thousand times more willing to cross lines with the galaxy at stake because the war was a thousand times as important -
They were wrong, apparently, about that, and he's been trying to hold that in his mind, that maybe he meant to destroy Earth and was wrong, meant to do it for a war where less than that was at stake. And of course, even in the best case scenario of total Yeerk victory, Mhalir meant for all the Andalites to die. Didn't prefer it, maybe, but had pointed his course right there and was executing on it with all due diligence, and he was perhaps only a few more decades away, and -
- five billion people experiencing decades of what they just did to Mhalir for five minutes -
- it's not even that Matirin cannot see a way to force his people to forgive that. He can. He can see a way through a thousand impossible things, as long as they're all merely politics. But - it does not entirely feel like he ought to, it does not entirely feel like it's fair to, it is in an important sense a betrayal. He does not think that his people are wrong, to want to kill Mhalir, and if it were up to him he would let them, and it is not up to him and Leareth never will allow it and so as many things as needed will die on this pyre - because Leareth is lonely, because Leareth recognizes something in Mhalir that Matirin does not, really, himself fully believe in, because they can't win without Leareth and so he can make whatever demands he pleases and it would not really be in his power, to not demand this, knowing that he could, not for the sake of something as intangible as the thing Matirin is acutely aware he is sacrificing.
Justice, someone might say, but Leareth does not assign that word or its associated concepts much meaning and Matirin is not wholly sure that he does either. Just that - just that knowing that the world will be better in the future with Mhalir in it - and he does believe that - isn't the whole thing, that it isn't settled, that it is a wrong in the world that will keep being one, a thing not reckoned with.
Alloran will never really feel safe, not a thousand years from now, in an Andalite country that decided to let Mhalir go free.
There are tangible things being sacrificed too. He could convince his people to give humans morph, end aging once Cayaldwin has the new morph setup worked out. He could convince them to give humans better vat meat. Or cheaper, cleaner energy. He can do lots of things, just not all the things, not all at once, and if he must throw all of himself instead at the cause of persuading them that Visser Three, in particular, should live - then if he can make that one cent cheaper by having given Visser Three a worse time in some way that helps him get it done, of course he will do it. He doesn't feel apologetic about it.
(And there are intermediate options, he has run through a hundred of them - force Mhalir into some other form, leave him in a pool for a hundred years, leave him helpless the way that his victims were, for as long as the collective time they spent enslaved - maybe there's something that doesn't feel like pretending away an important fact about the history of the world for the sake of its future. He's not sure. He is not sure Leareth can help him here, Leareth - and presumably Mhalir himself - are very psychologically odd, his model of Leareth is pausing again and again with an objection on his lips, unsure in what precise form it applies but suspecting it does, somehow - an ethos built in a world where everyone but Leareth himself is temporary -)
He is not actively thinking about any of this right now. It's there for Mhalir to look at, signposted in case that's helpful, but his conscious thoughts are mostly occupied by trying not to go mad about this, it's fine to need lots of consulting of imaginary Melody but he's going to be so embarrassed if he has to get real Melody in here. He wants the thing Cayaldwin has, except Cayaldwin's desired relationship with Mhalir is very simple and Matirin's is, well, very complicated. To put it mildly.
The thing Mhalir said a moment ago - Leareth knows you, Leareth trusts you; I see it through him, but - at a remove. I do not quite understand it. - is applicable to the other way around, really. He can predict Mhalir, but there's something else that's missing. Some sense in which he does not understand him. He wants that. He's not sure if he will get it or not, from this. Yeerking doesn't go two ways. But it seems notable that the thing Mhalir said is also so true the other way around. Maybe they do not understand each other for symmetrical reasons. Maybe when Mhalir looks deep inside him he will also see why Matirin does not understand him back.
And maybe not; this will still leave them better off, if not, because Mhalir will understand him, and that will help. He's suddenly anxious about that, when he wasn't anxious a minute ago - like maybe Leareth is wrongly imagining that understanding Matirin will help Mhalir work with him, because Leareth doesn't fully understand Matirin himself, and sees what Matirin lets him see - everybody sees only the bits Matirin lets them see, he's very good at it -