Serial Killers Have Rapidly Declined Since The 1980s
Since a dramatic peak in the 1980s, serial killers in the U.S. like Ted Bundy and Jeffrey Dahmer have been in decline for three decades. Experts have a few theories that can help explain why.
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Besides what they listed in the article, I would add lead exposure.
It's a short read, pretty good.
I'm shocked that wouldn't be near the top.