I've yet to hear of any right-wingers criticise the Koch brothers. Perhaps Themarorana is a rogue libertarian that doesn't like them, but I'd consider that one of the least-likely possibilities.

I'd also say that promoting fossil fuels, which are responsible for most of the prosperity we have today, is a pretty low bar to have to cross in order to be considered "evil".

ISIS are evil. The Leader of North Korea is evil. The Koch Brothers (or George Soros)? Not so much