Why is the right always so utterly gobsmacked by the arrival of the most easily predicted results of their nonsense? "Call for violence: get violence" does not seem, to me, to be a difficult equation to grasp. In the end, it doesn't matter what this shooter's politics turn out to be, if he or she even had any at all. The point is MAGA has put violence in the water and all the fish are swimming in it. This fellow seems to have been personally responsible for a lot of calls to violence.
There was an unpublished (to the best of my knowledge) study conducted by a researcher of my acquaintance that attempted to determine whether capital punishment is effective in preventing future crime. Cleverly, he compared media coverage of executions with murder rates in the areas where the executions were most covered. He reasoned that if capital punishment works as a deterrent, then the murder rate should fall for some time after the execution. In fact, the data suggested that the exact opposite occurred. Murder rates went up! His hypothesis was that executing criminals "taught" (for want of a better term) that killing was a way to solve a problem. Killing was an option that was on the table. The execution "put killing in the water." Get enough people thinking those thoughts, and some of them are going to take action.
I'm truly sorry for this fellow and his family, even though he was Nazi scum. Who knows? Maybe next week he was going to have an epiphany, renounce his positions, and become a force for good. I know it's unlikely, but, hey, so was Saul's conversion on the road to Damascus.
Now, the speculation part. As someone who is reasonably proficient with at least some firearms, the pictures of the scene make it look like whomever the shooter was, they made one hell of a shot. That's highly trained sniper stuff -- if this was "some kid with a screw loose," he's the luckiest idiot to pull a trigger since Lee Harvey Oswald made two precise hits on a moving target from hundreds of yards away with a cheap rifle that was complete crap. Odds are, this shooter had some serious skills -- and those folks, as a group, tend to lean a bit to the right, politically. I won't be a bit surprised if this shooter turns out to be more MAGA'ish than not.