Q says these people are stupid. what appears to be is - the more corrupt someone is - the more they were able to climb the "satanic ladder of success". IMHO mostly stupid people would sell their soul to the devil. competent people would realize they could make a living somehow.  so these people are not bright, but ruthless. they have no problem killing or hurting others - most sane people would not do such a thing. that is why we don't understand them. interesting that God is making these people like inhuman, stupid and nasty.