He doesn't swim naked, so he takes the summon anyway.
"That's right! I don't! The extremely small number of you I have managed to exchange actual words with seem very personable! This is a you thing that other species do not have."
There is a general chorus of "What?" "How?"
"This filth creature almost seems like it wants to cooperate with us," says another alien.
"If we can't even manage to cooperate with other people I don't see how we can expect to get along with a filth creature," says a third.
"Well, which is better: a world with both people and filth creatures, or a world with only filth creatures? Because I think those are our choices," says the first alien.
"An impure life is no life at all..." says the second alien, slowly.
"Come on, if you believed that you'd be out there rioting with the rest of them."
"That phrase you use for describing people not of your species is really kind of impolite," Cam remarks.
"I mean, you don't have to learn new words today, this is not nearly as important as the civil war or the identical civil wars probably going on on all your other planets, but it's really hard not to comment on. Do you have any clever ideas for how an indestructible individual with a matter-creation power could get everyone to stop fighting and ideally not commit mass suicide either?"
"Well, you don't have matter creation powers and aren't indestructible," says Cam. "I've considered just causing all the purity police to grow wings, but I doubt this would actually contain the damage..."
"I was thinking it might make there be fewer purity-keepers. I am irritated by the concept of purity-keepers, whose job seems to consist entirely of murder. But it might well do more harm than good."
"The idea was that it would discourage anyone else from attempting to purity-keep. But you do have a point."
"Only you would think of academic publications at the end of the world."
"I'm making some really interesting discoveries about mineral formations!"
"It's a pity the planet isn't being attacked by talking rocks, then you'd be just the expert we needed!"
"I'm not actually attacking you. I'm just sitting here," Cam points out. "I haven't directly killed anybody."
"Yes. But if I don't do things at people, then it seems pretty likely that eventually they'd come back to the weird physics place and kill humans. I'm trying to permanently solve that problem and it's really, really hard to do it when practically nobody will talk to me, let alone open treaty negotiations."
"Are the family members going to try to kill me? I'm getting kind of tired of people trying to kill me."
"...So either you're calling basically the entire army idiots or you didn't answer my question."