The Motive for the Second Movie was actually pretty unacceptable. He put many people's lives in danger, even killing some of them, crash a building just because... He was the butt of a joke? Yeah, I'm sorry, that doesn't seem to justify any good reason to target many innocent's lives, like Eri and Agasa. Even if they didn't they, still...
There's probably a few others from what other people from this thread mentioned but my mind is blank. Though I have to say Gosho's motives, even if they're BLACKMAAAAAIL a lot of times, still manages to evoke some kind of sympathy.