I believe it is a basic cultural interest. Europeans have been bashed repeatedly for thousands of years, whereas America has not.....except for the occasional European incursion and short-sighted home-grown assaults.
It's tantamount to being a tribal instinct in Europe with the close cluster of competing tribes/countries, each with their own bloody histories. There is a natural interest in survival and in some cases, weaponry.
Here we don't have countries but we do have comparable states with the bewildering civil war reenactments. Although, here in the mountains of New York, we are assaulted by New Jersey every weekend.
In Europe, when they read history, it IS their history and their immediate family history for generations. Whereas the average American's personal family history was in Europe.
Consequently, European men, WOMEN and children are more liable to be in-tune with pagentry.
I cannot help but notice the physical contrast, between participants on both sides of the pond. Europeans are younger and more physically fit. They gather by the thousands and participate in their own history. They are, whom they have read about in their school books.
European and American women have differing core values. It's genetic. It's inbred.
It would be a cold day in Hell when my wife would come home to clean a dirty cannon along with dirty dishes.
Sociology 101