It's a bit difficult to commit violent crime at that age.
Yet it's easy to sit on the internet posting and believing in outright insanity and extremism.
It will take until 2040+ for many of these people to leave the political system.
https://www.medrxiv.org/content/10.1101/2021.06.11.21258690v...
As for whether this is a matter of degree rather than kind, there frankly have not been enough studies done of pre-post illness, and there should be. I know that depression is common in cases of severe pneumonia, and maybe there is a loss of gray matter in those cases too.
If it turns out that lead exposure the culprit the throws a big monkey wrench in that.
Random thought as well, what if it turns out that the rise in obesity and type II diabetes is due to something similar?