I think it may be deeper than just 'gun culture'. Merkins have many attitudes which seem odd to European minds. Apart from the '2 places in life - 1st and nowhere' attitude that their culture seems to happily ascribe to, many merkins I have known over the years (WARNING: anecdotal content) have shared the firmly held belief that:
1. If you take away our guns, only criminals will have guns and we'll all be murdered in our beds
2. Because I have a gun, I am less likely to suffer a home invasion than someone without one (the inference being that the number of people wishing me harm is 'anyone who is not me or part of my immediate circle, and I'm not too sure about some of them')
Just what I've observed.