Sorry to hear about the homeschooling background. I have met homeschooled rebels but never anyone who rebelled that dramatically. Still when people are given a lot of truth and then reject it they often become much harder and more bitter than those who had less truth to begin with.
It’s amusing, sort of, that the MSM didn’t fail to mention he was “home-schooled”, which of course is a zip-file meme that once extracted, parses out to “nut-case religious whackos”. There’s never any editorial commentary with respect to public-schooled nutcases shooting up a mall/school/church however.