What other things did he do to make you believe he was “kind of unhinged”? I know about the memo thing, but I think it was covered in an inflammatory way because the press loves to play up a controversy. What else besides the memo incident did he do that merits his firing?

That is hard for outsiders to know. Google however seems to foster cancel mobs.

Python core people like Thomas Wouters and Gregory P. Smith, since fired from Google, canceled and libeled people like Tim Peters. All that matters is having a mob on your side and preventing the other side from responding.

By all means, explain what else he did. I've seen this claim made repeatedly on hacker news, but conspicuously noone seems willing to o substantiate those claims.