The 'exceptional action' which would discourage and eliminate 99% of those kinds of incidents would be teachers arming themselves. Not gonna happen, first because our stupid laws prevent it, and second because we're so infested with leftist activists at the school teacher level that they'd never do it. So get used to it NEVER changing.it appears it’s less the exception then it was when Columbine happened. Is it out of the realm of thought that there may gone a day where you can no longer refer to it as that? I am just making an observation and formulating an opinion. People being fed up (perceived or real) with the other things you mentioned is how we got Trump, who can probably be considered an anomaly himself, what makes you think other things, such as the mass shootings i am referring to can’t result in exceptional actions being taken by future generations?
That said, I congratulate you at reaching the point that I reached 25 years ago, when I realized that the social justice movement is NOT about solving problems, but about using the cause du jour to tear down social fabric. You seem like you're sincerely wondering why the problems aren't getting solved. Check in with me when your eyes are opened like Neo's in the Matrix.