Presumably, 11th century Europeans had incredibly sophisticated means to accurately diagnose psychopathy & didnt murder innocents.
Also, diagnosed psychopaths are all necessarily evil and should be executed, & this assessment of a group doesn't infringe on individual rights.

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I don’t agree with either of your propositions.
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I am not convinced this is anything more than a correlation.
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That makes sense. In “On Killing”, David S Grossman cites that there are 2% of th population is predisposed to psychopathic behavior
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Also, a continuously evolving social culture. Both of which being reversed now.
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What’s so unpleasant about that?
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Nah, it resulted in the clever psychopaths surviving and avoiding capture by making their murders look like suicide or accidents. Natural selection means we are now surrounded by very crafty psycopaths ... be afraid, be very afraid
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What are the rest of the world's continent's rate's for the same period?
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Before anyone invented large prisons or organized metropolitan police, the penalty for most crimes was death. It was the ONLY way to deter rampant crime of all kinds.
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are you just going to forget about the endless wars and the huge amount of attrition losses. sweden killed about 50% of germanys army in the 30 year war. sociopaths were culled very efficiently
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Previous to that anchient societies knew them by age 11 and took them out
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Starting a fact(that I dont really find that unpleasant) with lots wiggle room really fires up your audience and in return we get more facts and info..thanks @StepanMolyneux
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Interesting hypothesis: providing that the psychopathy was the result of nature and not nurture
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Holy mackerel that make sense
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Based on which records?
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Exactly, proving that in fact criminal behavior is genetic and can be reduced by genetic behavioral culling.
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I'm pretty sure he's going off of this paper. It makes some very generous assumptions to try to support it's conclusion imho. https://journals.sagepub.com/doi/pdf/10.1177/147470491501300114 …
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