Yes, but that would be more amazing than lead exposure explanation.
There certainly are other factors, but lead exposure seem like the strongest.
There certainly are other factors, but lead exposure seem like the strongest.
Not really, infrastructure changes of various sorts are often correlated with socio-economic factors. There's a reason Flint, MI's water system was wantonly destroyed and not that of a wealth Connecticut Suburb.
Anyway, there are still researchers doubting whether lead was the primary cause of the 80s-2000s rise and decline of violence. Just googling, see: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3829390/
But the main thing is single causes are hard in complex things like human society.