I visited a school for a career day thing and couldn't believe how locked down everything was. My high school had about 10 different points of entry, all unlocked, parking on every side of the building, and open lunch. Also, people could not legally open carry in Kansas, concealed carry was not allowed, and assault-style weapons were federally banned. Columbine happened and everyone was shocked, because shootings like that just didn't happen. So we apparently responded to that crisis by getting rid of all of those restrictions (not even requiring permits to carry), allowing the sale of title II NFA guns, and passing a whole bunch of laws prohibiting cities to issue any sort of controls of their own. It's all very mumped up.
I'm betting the takeaway from this is to bring bump stocks back and arm teachers. People have been calling for it and they are eventually going to get heard.