El Paso Shooter Was A White Supremacist

Dreher collects some fragments and links.
   Sounds like the guy started out as an odd kid, and was mercilessly bullied in high school. Somewhere along the way, he became a white supremacist--in the actual, literal sense of 'white supremacist,' not the expansive recent usage popular in some quarters. He seems to have explicitly said that he was not motivated by anything having to do with Trump, but had his views before Trump came along. Needless to say, one can't trust anything such a person says about such things.
   This pattern is puzzling. White dudes commit fewer murders than males of some other races...but some seem to just snap in these ostentatious ways, often motivated by explicitly racist theories/worldviews. This guy sounds like he was basically psychologically tortured in high school--but that sort of thing doesn't seem to have been a part of, say, Dylan Roof's history. Though almost undoubtedly such experiences drive people closer to crazy. And that almost has to be relevant.
   Probably all complicated by the copycat component of such things...but, still, it seems like an explanation of this pattern ought to be possible.