There is all sorts of talk in this comment section about how people would fight the US military and stuff like that. There people are in la-la land. I'm not going to elaborate on this but: I think it's closely tied with the American obsession with the apocalypse (see zombie/post-apocalyptic movies)
People have very very different expectations from the government now than they did even 50 years ago. No first world country (even ones that don't cherish liberty as much as us) in the past 50 years has turned to tyranny. There are studies about how past a certain GDP tyranny becomes unsustainable - and we're well past that point.
I do what to clarify that I'm not against the second amendment at all. But the argument that it's to fight the government is absolutely absurd.