You missed the part that says "viewed and listened to hours of video from the bus". The evidence is already available. The problem is that no one was bothering to look at it to check the kids were OK.
Kids will find ways to harass each other: between classes, lunch times, recess, etc.
This is true, but in most countries it doesn't escalate to mass murder. That's specifically a US thing (https://worldpopulationreview.com/country-rankings/school-sh...). So while you're right, I don't think it's fair to suggest it's hard to stop this problem or to resign to it being typical kids behaviour. The shooting aspect bucks the global norm.
No there isn't. America has 120 guns per 100 people.
The closest runner-up country, the Falkand Islands, is almost exactly half of that - at 62 guns per 100 people [1]. There's a sharp decline from there.
That said, I've long shared the belief that despite the absurd number of guns in the USA, and how they literally outweigh the population; the average person ought to re-calibrate have more faith in humanity and respect for their access to firearms, because the stats for gun violence are not nearly as high as you'd think if they're that accessible.
Guns per capita isn't a good measure because some people own a lot of guns. Gun owning households is a better way to test how many kids potentially have access to a gun - https://en.wikipedia.org/wiki/Percent_of_households_with_gun... - America is still top at 42%, but the next country is at 37% and there are several above 20%.
Kids will find ways to harass each other: between classes, lunch times, recess, etc.
This is true, but in most countries it doesn't escalate to mass murder. That's specifically a US thing (https://worldpopulationreview.com/country-rankings/school-sh...). So while you're right, I don't think it's fair to suggest it's hard to stop this problem or to resign to it being typical kids behaviour. The shooting aspect bucks the global norm.