This applies for people as well, a high percentage of the time.
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If we're applying Occam's Razor in good faith, "don't give a shit" trumps most other psychological explanations most of the time.
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Or the corrolary "felt like it".
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Most social taboos are only established and maintained through training & reinforcement.
Go to a different country. Do something you consider normal, notice the locals freak out.
Stay home. Notice how foreigners are always doing senseless things. They don't share your bubble.
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I'd consider it amazingly stupid how people so frequently miss such an obvious thing.
But then, they don't share *my* bubble, so no wonder.