I wonder if it's possible to be addicted to passing judgment and feeling morally superior. There are some, especially in the religious right, that seem to commit a lot of mental energy to things they purport to hate, like sexual deviance and infanticide. From a distance, at least, there seems to be a compulsive quality to it. Why decorate a roadway with messages about awkward or obscene subjects, grabbing your attention and forcing them into your conscious awareness, unless there was some kind of reward? Indulgence in covert fantasies? Or something like schadenfreude?