I don't know anything about the latest shooter but how would you have prevented the Vegas shooter from having weapons
I don't think so man,.. you can regulate guns away from honest people,.. but the crooks and the crazies will always get their guns.
Prevented? Who's to say what could have been prevented? I can only say what would have lessened his odds of having them. And those lesser odds would have applied to everyone else, too, making the incidences fewer.
The point you can't seem to grasp is that guns are easily obtainable no matter what laws are in effect.
They would not be less obtainable. They might be harder to buy at a gun store but they still wouldn't be hard to find.
And while we're on the matter of this mass shooting, here, let me show what good all those "thoughts and prayers" do: