I don't know. That would depend on whatever number is necessary for it to register in a statistically significant way.

Tongue in cheek aside, it's incredibly stupid to make sweeping, broad, categorical judgments of certain things because of isolated, exceedingly rare incidents. It's even dumber to make broad, sweeping laws around emotional reactions such as yours to such events.

Every school shooting is a grotesque tragedy, but means of fighting them exist that don't require gun ownership to be banned for the millions of people who not only peacefully use guns but also in some cases need them for an assortment of reasons. "What about the children?" has rarely been a good or honest argument for anything, particularly for badly considered laws pushed forth by bouts of moral indignation and self-righteousness.

You can argue all you like, but American kids have been dying in much larger numbers than they should, in a way that happens only in America, and not a thing has been done about it. Saying it's not an issue because it doesn't kill a significant percentage of kids is monstrous.

Even among rabid USA fans like me, American prestige is currently falling like a brick.

I happen to live in a country where civilian ownership of guns is strictly controlled and mostly forbidden. Despite this, in this country, many kids die because of gun violence, more than in the U.S in both absolute numbers and proportionally. "In a way that happens only in America" is simply misleading and shows how the media narrative I mentioned in my original comment influences your thinking.. All things have tradeoffs, even those that can sometimes be tragic. You're basing extremely broad generalizations on emotional reactions to what really are isolated tragedies.