People love to point at the U.S and its gun crimes as a direct result of the country's gun laws in particular, but overall, when certain very specific factors, population areas and very specific geographic regions are excluded, much of the country where guns of all kinds are easily available is barely more violent than your typical Western European country. The school shootings that people refer to are awful things, but statistically, they don't move any needle so much as an iota. They do however get enormous amounts of media attention. Other countries with very strict gun laws also have mass shootings and mass killings, both with guns and without guns, but again, less media focus because it doesn't fit certain narratives about the U.S being violent as hell because of gun posession.
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.
Even among rabid USA fans like me, American prestige is currently falling like a brick.
Do you have an article or graph (per capita or absolute) of deaths comparing the two countries you could point to for more info?