One big reason those on the right don't get upset about things like Susan Collins taking bribes, or Trump doing business deals with foreign powers is they figure "If it was that bad there would be an investigation, or congress as a whole would do something." They don't see that the social norms the entire system rests on are totally undermined. That social controls don't work if you don't care about them. So they can dismiss it as "everyone does it" or "the dems are just mad"