don't you guys have american movies though?
I dunno I canrt really think of any american TV shows with guns in them to be honest just cop shows and military ones and I never watch those and they dont really dominate the tv.
Another point though, if it was due to how I grew up as you suggested, then why was I strongly **against** guns into my thirties, it was a big issue for me and I often spoke out against them and pushed to make them illegal. It wasnt till my 30s that I changed position, which happened after a friend of mine challenged me to actually do the statistics on them myself and the data seemed irrefutable.
If your assumption was correct that it is cultural that pattern doesnt fit.