Everyone loves polite villains to contrast with brash and sarcastic heroes, but consider the dynamic of polite villains clashing with equally well-mannered heroes. It’s very good. Very civil. Very alienating to everyone around them.
"You seem a decent fellow, I hate to kill you"
"You seem a decent fellow. I hate to die"
Two people very courteously trying to murder each other is delightful to read or watch.