> The assault rifle over the back was definitely something weird but quite a bit of America is like that

Not really. Nearly everyone in my family has owned guns, including myself. We have family who hunt professionally. Several of us know people who concealed carry for legitimate self protection. Carrying a gun on full display is something you do because you have a specific purpose to use that gun. Doing so for entertainment is ridiculously unsafe under most circumstances and to the extent it’s part of American culture it’s a particularly toxic variant of that. But that’s a very limited subset of America. Most of our shitty gun culture is much more just plain American toxic culture generally