Culture determines behavior.
Look at places like Finland where there are 32 guns for every 100 people, the 8th highest gun ownership rate in the world. Their gun murder rate is close to zero. Eighty-five percent of gun related deaths in Finland are suicides. The same is true in Switzerland, Norway and many other countries.
Contrast that with Mexico where it's difficult to own a gun, yet the per capita gun homicide rate is ten times higher than Finland. The gun suicide rate in Mexico, a mostly Catholic country, is very low.