https://en.wikipedia.org/wiki/Roman_lead_poisoning_theory

Funny you should say that

The concerning part is that peak lead exposure was with Gen X. We're still being led by boomers and silent generation. So any contribution from lead stands to get worse before it gets better.

I hate this theory. It is extremely condescending, offers nothing, has no proof, but sounds plausible enough that many people believe it.

It is much more likely that our economic system rewards hostile behavior and that money has outsized influence in politics and a criminal justice system which lets rich people get away with crimes. That money correlates more with hostile behavior then lead, Instead of blaming lead, blame capitalism.

Just think about all the people who put lead in the gasoline in the first place, did they go to prison for their crimes, or did they make a bunch of money and retire in luxury.