Sometimes that's actually one of the benefits of a proper crook in power.

If he's your crook, he can actually keep you protected because he wants to protect his territory, and he'll buy your loyalty on the regular. When you're already a group being targeted by crooks, having somebody even more dirty is a high-risk, high-reward game. Your biggest threat is if he completely sells you the fuck out at some point. The 2nd biggest threat is that he's so charismatic that he actually sells you out and you keep voting for him.

If everybody's dirty, it's quite hard to argue for integrity, because an integrous system only works as you purge out all of the corruption. You can't half-ass it. Either everybody's clean, or nobody is.