I think you're generalizing too much. Rural communities take gun safety seriously. Farming communities take farming equipment seriously. Kids grow up internalizing the seriousness of these things, which is communicated expressly and tacitly their whole lives by countless people around them, including their friends. Plus they encounter walking examples of what can go wrong, like a missing finger, burn scars (not careful around bonfires or burn pits), or bullet holes (I knew at least 2 or 3 kids growing up with scars from shot). But put those same kids or adults who are careful with those machines in a similarly dangerous but novel situation, and they'll do dumb shit like anyone else. I'm tempted to argue they're more likely to do something dumb because they have a false confidence from their experience with other dangerous situations, whereas suburban and city kids may be more likely to be too scared to play around with any dangerous machine or situation.

I lived on a farm for a year as a young kid (farmer rented a couple of trailers on his land). I remember one day I was hanging around the hog pen watching the giant hogs mill about, probably contemplating trying to pet one. Mr Austin came by and sternly told me to not to reach through the fencing, then knelt down and showed me his ear, which was missing a big chunk.