Afganistan caused the US plenty of problems with 70 year old bolt actions and at best 1 gun per 16 people and a tiny fraction of the population fighting. Claiming the US population couldn't successfully work as an insurgency against its military is naive, especially when they have direct access to US logistics and economy.

This seems like statistical bias in measurement, but it's also likely that enthusiasts would have both more count and more valuable items while also being more likely to show them off.