No, it doesn't prove that guns in school won't solve the problem.
It proves you can't trust cops to do the bare fucking minimum.
If teachers had been armed? It might--might--have ended sooner with fewer innocent victims. At least the teachers had some skin in the game, and teachers usually care about the kids in schools.
My solution is making gun ownership less indiscriminate.
In my country, I'd have to prove that I need a gun for self-defense and pass a psychological and physical check.
Moreover, the license would have to be renewed after 5 years.
I have a friend that used to be a stripper ("exotic dancer", if you prefer). She tried to get a concealed carry permit--in Detroit--long before Heller v. D.C. and McDonald v. Chicago because she had a stalker. She was denied, because she didn't have any greater need for self-defense than any other person.
Who defines psychological wellness? For reference, I'm a gun owner, and I compete in shooting matches on a regular basis. About a decade ago, I failed to complete suicide; I attempted suicide because I was being seriously abused (verbally, mentally, emotionally, financially, and sometimes physically) by my ex-spouse, which had lead to serious isolation and depression. I believe that I am mentally healthy now--as did my last psychiatrist--but I am forever barred from owning a firearm in Illinois because I was held for observation at a hospital in the state. Moreover, people with serious mental illnesses are more likely to be victims orf violence rather then perpetrators.
Why should people that are less physically capable be less able to defend themselves?
You can't "prove you need a gun for self defense" until it's too late. Unless you mean "only of you're rich, important, and white (this is America mind you) enough that we think there's a chance those dirty not-white races may attack you."
Personally I don't think we should limit guns to the wealthy elite, I think that even us lowly poors deserve the right to protect our lives.
I've never even thought, "I need a gun" and I'm not rich or wealthy or affluent.
The only reason I'll ever learn to handle firearms is to shoot fascists if the need arises.
Damn fine reason. Unfortunately not everyone is as lucky as you in not needing one before then, too. I wish they were, but unfirtunately there are still people who want to victimize others. Less than there used to be though, crime has gone down since '93, so that's a positive!
How about "Less guns in the hands of those who should not have them in the first place", like every other civilized country does? And guess what, those countries know "school shootings" only as something America does.