The US just went through 4 years during which it should have been quite clear to everyone that the stability and norms of our government and civilization are very fragile things. Imagine for a moment Jan 6 actually was a successful coup, especially given the supposed coziness of the various police forces to said coup initiators. There are quite a few groups of people who might have benefited from having a strong civilian ownership and knowledge of firearms in that event.

Likewise, there's an entire country currently undergoing an invasion being fought not only by their regular army but by civilian volunteers too. And sure, such an event happening in the US is unlikely given our particular neighbors, but then again even up to the day of the invasion various analysts were sure it would never happen so predicting the future can be a bit difficult.

We don't live in a post conflict world, and our country isn't immune to bad actors.