My real issue with the Ramsey Bolton kind of characters isn't so much that they get to do bad things. Plenty of perfectly normal-looking good-guy-saying-the-right-things characters, both in their applications and on the grid, turn their kinks on or whatever in private.
My issue is that unlike novels or series where such characters get away with it for a variety of reasons - their thematic position allows them immunity, others consider the consequences of attacking them, etc - on MU* that doesn't happen. It's quite frequent (practically guaranteed, even) to see neonates standing up for that cute ghoul who's getting verbally attacked by the mean ol' Elder, or for peasants and minor nobles to stick their noses up at High Lords.
And when it comes to actual villains? To characters who in fact are IC obnoxious or get in the way? I've seen the occasional murder-party form, complete with OOC boasts about how they'd do it. Mind you, it doesn't actually happen often but for many players being the antagonist and seeing that kind of talk is discouraging on its own, which is why not many rear their disagreeable heads (or get to keep them for long).