Pool is full of mentally ill people because of a man named Thomas Midgley Jr. He is responsible for inventing tetraethyl leaded gasoline in the early 1920s, a solution to the knocking of internal combustion engines in cars. For thousands of years it was already known that lead was highly toxic, but the stance he and his company took was purely profits over environmental health concerns. He himself could not be near to his own product due to acute lead poisoning, and many workers at the manufacturing plants experienced hallucinations, pain, insanity and death as a result. Throughout the next few decades leaded gasoline was used until it was banned due to public health concerns. Scientists studying the concentration levels in the atmosphere drilled out ice cores from regions in Scandinavia to measure the history, and created the plot below. The first hump arounf year 0 was due to industrial activity in Rome, afterwards, another increase worldwide as Medieval metal production increased. Then a sudden jump in the industrial revolution and a huge spike during the leaded gas decades. Once it was banned the concentrations suddenly dropped.
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There is a direct correspondence between this spike in lead exposure, and violent crime 20 years after infants had been exposed to high lead concentrations, right around the time when pool was in its heyday:
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The following is quoted from the Wikipedia page in the lead-crime hypothesis:
There is no longer a large lead pollution problem, but the legacy of misbehavior of the "mentally-ill generation" designed by a man-made epidemic has culturally stuck in places like pool halls, populated by those who couldn't hold a steady job or support a family.
By the way, Midgley went on to later invent Freon, the first chlorofluorocarbons, cementing his legacy as "having had more adverse impact on the atmosphere than any other single organism in Earth's history."
Literally stupid crazy people playing an insane game.