So if gun control isn’t the solution what is?

Honest question. I’m pro 2nd amendment but this isn’t sustainable. Arming the teachers isn’t going to help. The guy was wearing body armor, even the cops couldn’t stop him from getting in. More money for cops obviously isn’t the solution for the same reason. This isn’t the first time a shooter wore body armor. A guy had a gun and returned fire in buffalo but the shooter wore body armor there too.

So honestly what is to be done?