My question is, why wasn’t he concerned about fingerprints, DNA? He touched everything, stair railing, rooftop, gun, towel. Either he planned on shooting himself or he was confident he couldn’t be traced.
Or maybe as Occam’s razer would suggest, we aren’t dealing with a rocket scientists perhaps, just some nut job left winger who played too much call of duty and belonged to antifa.
Or maybe he’s just dumb.