I get what you're saying, but it's wrong.
You are saying that firearms cause murders. That somehow the mere presense of a gun insights people to kill, as if it possesses them to do so. More people are murdered by means other than firearms than are killed by guns in this country. The high murder rate in this country is culturally driven, but not because of guns. Looking at the numbers for non-firearm related murders, they are still far higher than in other industrial nations. This is why I'm focusing on the Human element.