According to the CDC the US has ~33000 gun related deaths a year. About 62% of those are suicides, about 10k are homicides and the balance accidental/police shootings.Almost everything you have said is false.
https://www.investors.com/politics/...-s-isnt-the-worst-country-for-mass-shootings/
What you are suggesting would result in civil war in the U.S.
Mass shootings are generally considered 4 or more deaths in an episode, not 15. Mass shootings occur in the US on average once a day. You need to not cherry pick data that makes your argument look stronger and look at the whole picture. Shootings with 15 or more fatalities are relatively rare and usually are associated with some sort of politically motivated terrorism event. Outside of terrorism, mass shootings in places like Europe, when they occur, tend to be around military installations, because that is where you find guns in those countries. In the US it tends to be in schools and businesses mostly, since guns are widely distributed among the general population
For reference, per capita gun homicides in the US in 2010 was 3.61 per 100k. In Canada (the next highest in the developed world) it is 0.50 per 100k, so the US gun homicide rate is 7x higher than Canada.
In France the number is 0.20, so the US was 18x higher than France.
In the UK the number was 0.06, so the US was 60x higher than the UK.
In Japan the number was 0.01, so the US was 360x higher than Japan.
Those are big differences. No other developed country is even vaguely close. If you plot a bar graph listing the developed countries they are all fairly low, but with a giant peak where the US is on the graph. It is a clear anomaly among developed nations.
They are BY FAR the most violent country when it comes to gun homicides. In fact, if you look at the relationship between gun regulation, there is a clear correlation between the levels of gun homicides and the levels of gun regulation. The countries with the highest levels of gun regulation are also the countries with the lowest gun homicide rates.






