LogFAQs > #972069161

Voldemort and Palpatine represent ideologies, and people who believe in those ideologies follow them. They're not really a threat to their followers. (Well, Palaptine is, but when he kills his underlings it's usually a 5D chess move and lowkey so nobody knows he was behind it. I'm sure most everyone in the Empire tries to avoid pissing off Vader though >_>)

Voldemort is a surprisingly forgiving villain, though part of that may be because we're seeing him trying to regroup his old forces after everyone abandoned him/got killed/got arrested, and murdering them for petty failures wouldn't endear them to return. Come to think of it I think the only follower he murders that didn't "consent" to it in the first place was Pettigrew, and that was for outright betrayal. Snape was killed but he had gone into the plan knowing his death was a likely outcome to secure the elder wand iirc. <_<