Orochimaru was: Because i want too
Madara was: Because i want too, and a magical rock told me too
Sasuke was: Because i want to kill itachi
Nagato was: Because a boy died
Obito was: Because a girl died
Gaara was: Because a sorta ambiguous uncle died (I can't be the only one who though that was a girl, right?)
Most of the akatsuki were: Because i want too. Itachi wasn't evil.
Indra was: Because i'm butthurt
Ashura was: Because i'm also butthurt
Kaguya was: ME WANT CHAKRA
Toneri was: I unthinkingly obey a clearly insane order to commit genocide.
Hagoromo was: I Don't Like Ninjutsu, so i'll kill everyone with Ninjutsu
Hamura was: I've played far too much Majora's Mask
Nagato was the best villain off top
and his reason for being evil wasn't stupid
if you were betrayed by someone who wanted to have truce with you and your friend who you spent all your life with was killed because of that I'm pretty sure you'd be like "**** life, **** you, **** everything else" too
Nagato had a reasoning for not only capturing the biju but destroying konoha while madara was contradictory in the fact that he wants peace but is willing to kill an army of Shinobi to take control of the world
<div class="bbWrapper">All I know is that Pain's method toward peace was the most retarded. Same for Sasuke.<br />
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Ima go with Madara/Obito then Oro</div>