A lot of children (boys especially) in America aren't taught that rough play is OK, anymore. Wrestling and rough housing, as I did when I was a kid (GenXer) is actively frowned upon and stopped, I've noticed, more often than not. I have a 7 year old and I'm amazed at how many of his friends are shocked when they see my son and his cousin wrestling about and race to tell me they're "fighting". I feel bad laughing when I have to explain to them that they're just wrestling around (his cousin is a girl and man, I hope her high school gets a girl's wrestling division - her take dows are awesome). I think American kids are so unfamiliar with physical combat that, for a lot of them, their first step to fighting back is to reach for a gun because that's all they've been shown on TV. Physical combat sport in any form is just so foreign to them, using a gun is much more intuitive.