Psycho's and true believers have been doing this for centuries around the world. IMO it's not our problem (directly) or will terrorist / ideology attacks ever stop.
While here in the U.S. The gun grabbers are more interested in eradicating the gun, instead of looking at what causes people to go off the rails.
At the same time Ignoring the Who, What, When , Where and Why this happens.
Parkland and the education system, is a microcosm of leftist turning an eye to trouble, waiting for something to happen.
Then DEMAND Action. Hand wringing, media colluding to add one more layer or restriction on a Constitutional Right.