"Many behaviors of the Valar bewilder me," she acknowledges.
That is what he promised in exchange for his parole, though the Valar did not tell the Elves because they hadn't admitted to the Elves in the first place that suffering could exist even within the Halls.
They don't suffer because it's necessary. They don't suffer because it serves our ends. They suffer because Eru wanted Melkor to be the embodiment of all evil in the world.
And now, Loki, do you see why I think you might accept my offer of a job?"
"Well, you've picked up an idea of the sort of compensation that might interest me, but if Melkor can't muster so much as a whim to stop being so darned evil all the time I'm not sure why I should expect him to hire me on as, what, Executive Orc De-Sufferer?"
"I've never actually had it verified by a disinterested party that swearing works the same way for anybody other than Elves and orcs. And you're being very vague about my proposed job description."
"Oh, so that will work, I had wondered. If you want to kill the Valar why all this fucking around with armies of orcs and packs of werewolves?"
"Well, until you sign on, we need Men to do anything other than play our designated part. This is more unbearable for us than for the Elves, because we know our fates to a much greater level of detail. We are still in a position of relying on armies to control territory, though hopefully not for much longer. The werewolves are a hobby of mine. They're transformed Men, so might be able to have interesting free will once they're powerful enough to actually change the course of the war."
"And the territory control matters because of that thing where you dig in and build up magical oomph?"
She hopes that being off its turf wasn't the only reason why the Balrog was an easy target. "What's the endgame? Dig in, hope the Valar aren't bracing themselves too hard, vast continent-destroying warfare, suppose you win, then what?"
"Who has been giving you such detailed personality assessments of me? That carrot implies a long string of successes much greater than killing the local Valar, though."
"Maybe I should cultivate an aura of mystery next time I'm visiting a strange planet. But my question was more limited in scope. Endgame for this planet? Anybody who survives the continent-destroying warfare? Or is the plan scorched earth, take off into space?"
"And everybody else gets to go extinct, I presume, or are you planning to offer me an evacuation plan?"
"If you made yourself useful enough I suppose I'd consider it. There are a thousand orcs for every Elf and Man, Loki, speaking only of already extant ones. And time passes faster in Angband; they reach adulthood in three or four years, they have ten children a year. If you side with the Elves and win this war all of them suffer, forever."
- here, I'll make it easy. I will tell my lord Melkor to fix it right now. You can verify on your way home that all of them are fine, though I suppose you can't verify that dead ones were suffering or now aren't. You can verify that our word is as inviolable as any Elf's, and then I'll swear to the truth of that alongside everything else. How long do you think you'll need to make your decision?"