Well, so in your logic those people decided to become ah themselves by punishing me and taking some of my rights despite that I have nothing to do with them, there killed friends and those ah who killed there friends.
Answering your question about does right to bear arm worth 40000 lives. My answer to this is yes. We pay bigger price for luxury to be moved from point a to point b by a car. Also I would subtract suicides and intentional homicides from that number because those are controlled by different factors, not by just fact of having guns available. So gun related accidents are much smaller number and sure it worth theft right to bear arms for the people.