Serial killing and violent crime rose after the introduction of leaded gasoline resulted in massive lead poisoning in utero. Banned at different times, in each country, violent crime starts to decline 20 years after the banning of leaded gasoline.
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Still happens.
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Media attention? There is so much news now, it is impossible to stand out as a killer.
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It's also possible that the many TV police procedurals about serial killers have educated the killers to: * make murders look like accident/suicide; * avoid leaving fingerprints and DNA; * switch up MO; * commit only 1 murder per jurisdiction; * choose marginalized victims.
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