The elites will medicalize the problems of the shooter(s), and the whole thing will fall under HIPAA secrecy.
If the circumstances can't be used to push the agenda of the left, the whole thing will be dumped into the memory hole, just like Loughner and Holmes have been.
If a connection can be made to Conservatism, even of the most tenuous nature, it'll be pushed wall-to-wall 24/7.
If the shooter is white, he’ll be labeled Christian or conservative, an unfriendly loner who gave neighbors the creeps. If he’s any other color, but is former military, he’ll be billed as ex-soldier. If he’s any color other than white, and not military, it’ll be an incomprehensible tragedy, he’s the victim of mental illness, and his family will sob about what a wonderful young man he was.