Fischer was
· A Brilliant Chess player
· A Bigot
· A Prima Donna
· Highly Principled
· Brave
· Somewhat Paranoid
· Maybe he had Aspergers
He didn't "go crazy." People just stopped putting up with him when he stood up to the U.S. in his second match with Spassky.
I can't think of a much better example of Aspergers, than Bobby Fischer.