I think it bears mentioning that the “deranged maniac” title isn’t the whole story. I don’t know about this guy in particular, but the a lot of these guys are all part of far-right online cliques that share propaganda amongst each other while valorizing the guys who do this shit.
Plus, it is pretty bipartisan, everyone hates health insurance companies, more popular leftward, but the amount on the right that supported, or at least did not condemn, him was pretty striking