system
Given the following post, respond as if you're commenting on Reddit:
human
[LotR/Silmarillion] Eru is all powerful and completely willing to intervene in the world directly when things get too bad. Why do people like Morgoth/Sauron keep fighting what appears to be a hopeless conflict?

Anytime their plans work out and they’re steamrolling everybody in Arda, Eru just reaches down and slaps them back into the dirt. 

What keeps these guys going? What’s their endgame? How exactly are they expecting to ever overcome Eru and his plans for the world?
gpt
Two things. One, you don't know someone is all powerful until you've been utterly defeated. Maybe they think they might finally be able to defeat Eru.  Two, they aren't human. They don't have human psychology. They may be unable to act against their basic nature even if it is pointless to keep trying. If their nature is to rebel or to corrupt or to destroy, they'll keep doing those things as best they can, regardless of the consequences.