Very simple. Two reasons:
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To fight nudity. Y’all outside this country might know this, in America nudity is still seen as something dangerous. People need to defend themselves against it. Nudity is everywhere! You need an automatic weapon to survive it.
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To fight buses and trucks. Americans are dead scared of buses and trucks. They won’t pass them. If they do, they accelerate as if those big machines were going to change their minds, and jump on them for no other reason than being predators! Enters the AR-15. Every car probably has one in the trunk, just to be able to make it home safely through 18-wheelers and bus lanes.
Naked bodies and large vehicles! It’s hostile out there y’all.