I would never go so far as to say that the United States has a monopoly on violence, but it certainly occupies one of the front ranks. From 2014 to 2020, there were 108,449 deaths by firearms and 209,258 injuries, not including suicides, of course. Those are impressive numbers-with an upward trend.
It sounds harsh, but as long as these, let's call it strange, gun laws exist, as long as there is an association called NRA, as long as rampages and mass killings will be part of everyday life in the USA; the people who fight against this legislation won't change that either. It is in the nature of Homo sapiens to exterminate itself - and the day of the last judgement will come - it is closer than one dares to hope - I guess so on the next 50-60 years.