Obviously, politics mean nothing in these cases, as this guy was plumb crazy. Conservative folks just feel vindicated though, justly, as crazy is crazy.
Poor parents and victims.
I'm making the point because the Left wants to make violence with guns (except in places like Chicago, etc) a problem of conservatism and the 2nd Amendment.
And about your "poor parents" - it strikes me that the parents of the shooters in these cases have tons of signals that things are very wrong with their children (and I am sure that in some of these cases they asked for help and didn't receive it, probably for PC reasons). But there ALWAYS are signals that their children are a threat.