Board Thread:Theories and Speculation/@comment-28456867-20160525000548/@comment-4912646-20160527223527

The Nine-Tails attack and controlling the Mizukage could just be petty revenge against Minato for not saving Rin and Kiri for essentially killing her, but it seems like a bit of a stretch given how planned and purposeful the rest of his actions were. He also claimed he infiltrated Konoha to try to fan the flames of war, so it almost seems like he just enjoyed being evil for evil's sake. The guy did try to stab a newborn baby after all.