Yes, lead poisoning could really be a cause of violent crime

Actually he's right. The Roman empire did have bigger problems that contributed to the collapse of the western empire. Lead poisoning wasn't a major one.

Yeah, I've only ever really seen lead poisoning brought up in the context of Caligula, precisely because such a strong case exists for him. Never really seen a large-scale attribution of the problem throughout the Empire as a whole.
 
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