All the noise made by the usual liberal suspects is just virtue signaling. There's nothing stopping some mad man from collecting a few pistols, shotguns, etc. walking into some senior center or other place congregated by innocent, unassuming people and start blasting away. The body count could be just as high as the LV slaughter with minimal planning ahead of time by the killer.
That's just the unfortunate fact of life in the U.S. these days. There are a lot of crazy people capable of inflicting mass casualties by a number of methods other than guns. And nobody will be able to stop a crazy, committed person from getting a gun if they want one.
The only protection is to try and identify these people before they strike (a very difficult proposition), be aware of your situation, and for individuals to be possibly armed themselves.