This is the only case that has a specific target, politicians, to murder. Even in that case we still think mental disorder somehow played a part in this shooter. There are many and many political junkies with hatred today. How many of them murder people? one of millions, i.e., almost none. People hate, but people also are rational. Those people, murder the innocent without specific target, are mainly because of mental disorder themselves. Minor things just can be a trigger, but not a cause. I think you actually know this better than anyone else here. Please elect a psychologist as our president if you wish.