Oh I do think you are right.
But we are in something of a cultural trap in the US. Guns are seen as a birthright by many many people, and due to rulings not that long ago, they can point to modern Supreme Court interpretations of the 2nd amendment that yes, in constitutinal terms, they kind of are.
People tend to stop thinking when guns are discussed, on both sides. In his book Freakonomics, Steven Levitt pointed out that inground pools were far more likely to accidentally kill children than guns were, comparing group to group. Comparing the danger of an individual in-ground pool to the individual gun, in-ground pools were far far more dangerous. In-ground pools are deadly dangerous, and there is in fact an active but low key movement to ban them which has met with some success. But despite the greater danger, pools well, are just not as sexy as guns are, because they don't draw on the national ethos of the Minuteman the way guns do.
And the Minuteman ethos is what the more extreme no-limits-at-all types gun owners have in mind, live by, point to. Using their guns as defense against the tyranny of the government is not just hot air, they mean it.
How many of theses extremists are they? I suspect enough to make our current death rate by guns look like an oasis of stability if they panic and revolt.