Apollon seems to be connected to the Creators. And he seem to think they can be back at any time. So it may be null and void.
Plus: judging Archanfel on his heartfelt desire to prove himself to his creators is unfair. It's literally the reason he exists. What else does he have to live for? Friends? He is the only one of his kind in existence and nobody can truly understand him. Family? See previous answer.
If he wants to prove his creators wrong by showing he can turn humanity into an army to fight for them (if that is what he wants, rather than turning humanity into an army to go kick their asses) then I can't fault him for that. You can't really argue that humanity shouldn't be used like that because as a matter af fact, that is exactly why humanity exists, just like Archanfel himself.
Humanity, as it is, is a failure - a corrupted strain, stunted by thousands of years of mutation, still full of belligerence but with nothing to focus it on properly. We're supposed to fight like demons - not each other, but some nameless, unknown cosmic enemy. Without that enemy, we get endless war and strife. (Indeed, perhaps the Advents are actually a very peaceful race, and very bad at warfare, comparatively speaking).
Unless Archanfel finds a new way to live, then perhaps there is no other choice for him than to die. I don't see how it could be otherwise. He is a living hyperweapon, capable of commanding an entire species of lesser bio-weapons, and of shattering a planet all by himself. What is he supposed to do? Get a job? Get a girl- or boyfriend? Move into an appartment and spend his time off playing WoW and Assassin's Creed?