Some of the newspapers today claiming that the recent massacres in the United States are a result of America's special culture.
The problem, bluntly, is access to guns. That's is why the murder rate is so very high in the North of Canada; it is because people have access to guns and disputes which would otherwise end in a fistfight end shooting. Disturbed people with guns are far more dangerous than disturbed people with, say, knives.
Limit gun access and the number of shooting deaths will fall.