>>80733719>>80739721i feel like as long as the internal logic of the actions and the ideas are explained and consistent, it shouldnt come out as dumb.
For example lets say Dio from jojo. His motivation is extremely basic and flat (me want power me strong me best) and the justification is equally basic (my dada beat me. im mad). It still works like a charm because that's just a way to show he's a piece of shit and you should dislike him.
Dont try and make a complex motivation if the villain is simple and viceversa, write accordingly.
With that being said, think of the character. Are they doing something evil because X? well, is that X reason justified or is it an overreaction? if it feels like an overreaction...then how can you make it so it isnt? remember that multiple factors can stack.
If anon is the saviour of the universe because he saw all the evil in the world, then make it so he sees the good thing or he believes in beauty or whatever.
If he wants to end the world because his ant farm got destroyed then make it about how the ant farm was the last thing he had control over on his shitty life, how his dad gifted to it before he got sent to super hell or how the ants ate his dog or something.