Thread:LucidPigeons/@comment-27729149-20150425083602/@comment-27560932-20150624013520

Yes; unless a tragic villain can actually find a way to invalidate their own tragedy, they'll never become a Monster. It is possible for a villain with sympathetic qualities to cross the Horizon, and if a character is established as tragic or well-intentioned, it doesn't stop them from jumping off what's known as the "slippery slope," which is essentially the downwards path towards evil.

And yes, that's generally the basis of an evil villain. You have to have someone to root against, and even if they're not a CM, it doesn't mean they're not unsympathetic or otherwise bad people.