Dumb as they are, they can always point to a right that is even dumber. They can point to wild theories of conspiracies, when it is obvious to everybody that they cannot organize a single working theory, much less a conspiracy. They can point at rightists who declare they represent The Only True Religion, which is a laugh to everybody. Nobody believes some clown on the right who declares he is some kind of Political Pope. Nobody believes in vast conspiracies.
People CAN see how stupid and callous our leaders are.
But as long as those who denounce them are even more stupid and even sillier, they will maintain their power. Unless a right winger learns these facts, he is going to go nuts, as so many right wingers do. The reason right wingers all seem to go nuts is because they enter into the liberals' world of delusion. It is generally recognized that psychiatrists tend to be a bit nutty. One of the reasons for this is that people with mental problems tend to study mental problems.