I think you have yet to appreciate how rural America is arranged. [ . . . ] These were towns where 200-600 people was common, very insular and isolated.
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I think that's what fuels that psychological need for guns. There were guns everywhere, gas station guy had his visible behind the counter. Virtually every house I delivered to (mostly the upper classes) had gun cabinets. I think that when you perceive your society as hostile and dangerous, owning a gun helps balance things mentally.
That said, I see parallels in that mentality in other social groups. People in the suburbs who have no idea who their neighbors are because theirs no social mechanism to introduce yourself. Urban dwellers who have to call the police to make their neighbors turn the music down because they fear getting shot asking themselves. I see guns as a band-aid on the psyche of society.
America lacks a group identity right down to the town level. Sure people are happy to wave a flag and downright pleased to ostracize people who don't support the troops, but the idea that our governments are forums for communities, states, and the nation to come together and advance the common interest is dead. Government is, not altogether unreasonably, seen as one more danger in an already hostile and broken world.
That's why America is scary, not because everyone has guns, but because of the individual fortress mentality which drives the demand.