I've just been watching a documentary 'Teachers Training to Kill' produced by Channel 4 (United Kingdom TV channel). As the title suggests, it is about arming teachers and training them to kill perpetrators who are shooting up schools in Ohio.
We don't have this problem in the UK. Exception Dunblane 1996. The UK government quickly banned ownership of handguns. Since then we have not had any school shooting since. Should the USA observing the success of a lack of guns go down the same route? In answering this question, ignore the Constitution, as given the will of the people, that can be changed.
I remember that going out live on TV. As an aside, the TV show that was interrupted had a FBI profiler on at the time, and he described exactly what the murderer was like and his pattern of life, including his likely looks.