So a registered Republican tried to assassinate the leader of the Republican Party, when he and his followers constantly agitate for political violence, including the hanging of their own VP, and then the Republicans blame the assassination attempt on Democrats? Got it.
I suspect Crooks was depressed, angry and suicidal. I think this was about his suicidal nihilistic rage. Since mass shootings have become common, Trump was an opportunity to do something even bigger and more dramatic while committing suicide by cop.