"Those who do not learn from history are doomed to repeat it." (some famous guy)
"Those who do learn from history are doomed to watch those who did not go right on and repeat it." (somne guy who ought to be even more famous)
There is going to come a time when, in spite of each and every single gun control law put in place, and in spite of the fact that gun control as a whole is identified as overwhelmingly controlling almost all aspects of life, that some Va Tech, or Aurora, or Sandy Hook, or West Nickle Mines, or ___ type event will take place and the society will suddenly understand that gun control laws only control the law-abiding and do nothing to stop, or even slow down, evil persons intent on killing by using a gun. At that moment, when some parent stans in the middle of the street and yells that gun control is responsible for their little darling lying in a pool of blood, we will get some sort of useful means of stopping a sudden mass killer - without having to wait for the hired armed guard to get "here" from "there".
But, until then, we are going to be told that X cannot be trusted with guns because a, b, c, ....
Someone well known if not famous is supposed to have said "The only way to stop an evil person with a gun is by a good person with a gun." When we get past the "control" part of gun control and start dealing with stopping evil persons withh guns before they can rack up their score, then we will see teachers getting training for active shooters. Until then they ate only going to get suggestions and training on how to increase the odds of not being the victim of a sudden mass murderer.
stay safe.