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David_Gerard comments on Long-chain correlation: lead paint and crime - Less Wrong
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Not quite - he's arguing that this is not good evidence that the crime decline is substantially caused by environmental lead contamination. He says a few times it's an interesting and plausible hypothesis, he's stressing that this doesn't constitute good evidence for it. The text is an essay on reasoning, not an essay on lead and crime.
And its worth noting the cohort studies Pinker suggests need to be done HAVE in fact been done- and while not a slam-dunk case, are largely supportive of the hypothesis (at least if Drum's article is to be believed, I haven't yet dipped into the research papers)