Comment by mircerlancerous

I'd like to disagree with this but it's the only thing that's worked for me.

If you do stay, there's a good chance the manager will eventually be found out. You can play a subtle sabotage game in the background to expedite it. Don't save them from their mistakes, and undermine them by talking about the mistakes. Don't blame them but rather let conversation about mistakes lead them to the same conclusion.

Personally I'm not patient enough to stick around anywhere, so I definitely wouldn't in your case unless I really cared.