[rrauenza]

This supports that, yes, it was more aggressive 40 years ago, and simulatenously remind us that correlation isn't always causation:

https://www.forbes.com/sites/alexknapp/2013/01/03/how-lead-c...

[mjburgess]

Yes, but then there's studies showing spanking children makes them more aggressive. The physical abuse of children is by the physically abusive who were themselves physically abused.

It isnt merely accidental. Of course it isnt the explanation for WW2, or the 1970s murder rate. Neither is lead.