Demagogue

For some reason, I was reading this piece in Slate about a photographer who takes photos of sobbing children - sobbing she induces by doing things like giving them lollipop and then taking it away.

Anyway, I greatly amused by this remark

An asshole who makes great art is an asshole who makes great art; but an asshole who makes lousy art is just an asshole.

Adopt that and then simply substitute context-appropriate words for "art" as needed and you've got yourself a pretty solid worldview.