A major factor in gun related deaths seems to be not the guns themselves.
It's simply that Americans are much more likely to kill, to go for lethal violence, than many other nations, to the point that non gun related murders in the US are more numerous per capita than most countries total murder rates. The reasons for that are unclear, but the most important factors appear to be that Americans are more miserable, more stressed, more isolated and more distrusting of others than other people living in other nations. Which isn't something you'd say is a problem in a nation seemingly made of extroverts.
It's simply that Americans are much more likely to kill, to go for lethal violence, than many other nations, to the point that non gun related murders in the US are more numerous per capita than most countries total murder rates. The reasons for that are unclear, but the most important factors appear to be that Americans are more miserable, more stressed, more isolated and more distrusting of others than other people living in other nations. Which isn't something you'd say is a problem in a nation seemingly made of extroverts.