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Humans evolved for survival over 2 Million years to the current form 200,00 years ago as hunter gatherers. Altruism evolved to advance small tribes of related individuals. Outgroups were competitors. We have only become super social in the last 10,000 years and still have stone age neuropsychology in our modern skulls. Feel good transmitters that used to fire when we found and ate a rich food source now give instant gratification from greasy fast food and seeking out the purchase of the newest gadget, car, yacht. Outgroups are blamed for anything that goes wrong.
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