Meanwhile, continue to dismiss the moral decay of society, as you seem to do in each of your posts, and point this 100% as a school safety issue. Yes, schools need to be set up entirely differently in order to at least hinder what happened today, but you need to go back to the reasons this happens in the first place if you want to tackle the full problem.
You have indoctrination from educators, parents and politicians that allow the acceptance of our youth being allowed to alter their bodies, remove their natural born gender label, force feed their sexual lifestyle into society, etc.
When our school systems become an ecosystem of what society is becoming, that is huge problem. The three R's in schools have become secondary to some kid getting headlines over not being allowed to use the bathroom they want to versus the one they are supposed to.
When we start pushing right from wrong, and this starts at home, you'll see things start to change, however, continue to allow the anything goes b.s. and it will get worse.