I believe (without a whole lot of support) that Europeans mostly got over the fetishization of violence during the interminable wars up through the 19th century. They had one last massive burst in the first half of the 20th, but it was already clear that the new order was about trade rather than conquest.

America was largely isolated from that. We had plenty of wars but the biggest was just against ourselves, and we turned it into a story of great heroism (rather than admit that the losers fought a bad war for bad reasons). We came to be proud of our violent adventures as we colonized westward.

If this (absurd) chain of reasoning holds, we still love the excitement of violence while Europeans are largely over it.

And this (dubious) theory also explains the fear of nudity. European wars were often nominally religious. (In fact religion was mostly just an excuse for the same old wars of greed, but it makes a better cover story.) Being proudly religious is kind of embarrassing now.

Americans didn't keep killing each other over minor doctrinal differences, at least not on a mass scale. Instead we showed off just how devoted we were, topping each other to be more and more against what everyone else was against. Literally, holier than thou.

Not everyone is into that, but for a variety of history reasons the ones who are have outsized power, and they hammer anyone who crosses them. Most people wouldn't care, but the ones who care, care a lot.

This is, as I've made clear, just a barely-informed guess. But I do think it has some elements of truth to it.