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I think it's a bit more complicated but: 1. I think lead causes incurable narcissism. 2. The most narcissistic are serial killers. 3. Wind patterns from areas with lead refinery match high serial killer areas. 4. This also increase crime in general so may only be correlation.
5. High serials killer counts also match wind patterns from high pollution areas. 6. It could be that lead also causes a kind of autism because there's some confusion in identifying narcissists vs. high functioning autism.
