Batman: Arkham city

Arandor has no one in the negative roles except Amko.

And he advocates for the execution because Amko is having fun.

First, he says he has an amazing role and everyone is doomed without him, then he gets executed and doesn't reveal himself, then when it's time to reveal himself because he's really about to be executed, he backs down, hiding behind his mysterious role. I'll rephrase it as a question: Will an awesome town role scare the town by not revealing itself on the scaffold?
Arandor has no one in the negative roles except Amko. And he advocates for the execution because Amko is having fun. In short, there's no investigation. A great argument in the spirit of "well, Amko is probably Mafia..."
Plus, he loses his vote and disappears. A town role would never let things go on like that.

And the cop, even though he had two successful night investigations, albeit with a 50/50 chance, would have revealed himself if he had been nominated for execution.