The hard simple truth is that if there exists the will to snuff out lives, a way will be found. See Europe for prime examples.
These tragedies are being quickly politicized and turned into debate where there is no debate to be had. In other words, they can take it up with the U.S. Constitution.
I too have my doubts about the narrative being fed however that surely doesn't detract from the problem at hand. Bad people do bad things. The prime component being, in this case; why did he do it?
As is the standard operation procedure of government entities and such, address the symptom, forget about the problem.
"They" don't want to go there because then this whole charade is exposed for exactly what it is.