The reason and ts almost at zero end n the USA and at 0 in other countries is because America is riddled with massive mental health problems. It has nothing to do with guns.
That's why when you see in other countries they ban or restrict guns in almost every case homicide and violent crime rates skyrocket for decades (and rarely fully recover), because the issue was never the guns, violence is the issue and there is more of it in the USA than many places.