Gun control is ineffective. The real issue plaguing the US is poverty and mental health. Just look to some of the areas with the most strict gun control laws, they're also the areas with the highest gun violence statistics in the country. Chicago, New York, LA to name a few.

One of the reasons places like schools are targeted so often is because it's a known soft target. Gun free zones are known to have less resistance to the scumbags and cowards that are doing these heinous acts. If they knew that every adult could potentially fight back and give as good as they get, I would expect there would be far fewer mass shootings. These people are cowards praying upon those who cannot resist, and even the threat of potential return fire is enough to deter most.

I'm not saying that we should force every teacher to become certified and carry, but it should be up to them whether they choose to fight for their students, and if they do they should have the same or better tools than the bad guys.