@fresh_42 The below is all me free-wheeling, I expect folks who may have actually studied the history of what I am opining on can poke plenty of holes in it.
I'll contend that one cannot make sense of the status quo wrt to firearms in America if one approaches the question as though the current situation were deliberately arrived at. Looking for an answer to the question "How can Americans want this" is as fruitless as asking "How can Americans want the medical care system that they have".
The status quo is a lump of unintended consequences arrived at via historical failure of political will to keep legislation appropriate to advancing technology and changes in American society making firearm ownership much less a practical need for much of the population as the rural / urban shift in population grew.
I think the right question to ask is more along the lines of what Americans ask themselves about delivery of medical care - how on earth can we fix this, and why are we stuck?
I'll take a stab at 'why are we stuck'. I still have no idea about how do we fix this, or even a good articulation of what I think a fix looks like, if implementable.
1. Distrust of government causing fear of being disarmed and leaving the only weapons in the hand of the government that has self-serving bad intentions. (I admit to have some sympathy for this viewpoint at this moment in time, even though I don't own a gun and I don't think owning a gun would make me feel better or safer in that regard).
2. Distrust of government causing fear of ineffectual application of firearm restrictions, only law abiding citizens will actually be disarmed leaving them at the mercy of still armed criminals.
3. A general endemic sense of entitlement among gun enthusiasts to own any weapon in existence based on US history of always allowing just that, with few exceptions. I think no one argues that they should be able to own a tank or a howitzer, but many Americans do argue that they should be able to own fully automatic weapons.
And related to that point ....
4. Effective well-organized tactical lobbying that can stir emotion very quickly with gun rights folks to exert instant pressure on legislators any time even the smallest restrictions are being debated.
Related to my point on trust, I don't know any Americans (I am sure some exist, though, I hope very few) who are upset that they cannot carry a gun on an aircraft. I chalk this up to trust in two things - first is trust that no one has a gun on the aircraft one is boarding, the second is that the pilot and crew have only good intentions and one doesn't need a weapon to protect oneself from the ruling authority of the aircraft (the pilot and crew). If we can get this 'airport' level of trust around our government, perhaps that would break the deadlock?