Lead in politicians
So the U.S took lead out of paint and gasoline and 20 years later crime rates dropped.
Maybe there is an arc like that having a further 20 or 30 years delayed effect on politics. I'm figuring elected politicians are typically 20 or 30 years older than the young men responsible for the crime numbers.
In other words, maybe our leaders are at the height of their lead induced criminality and psychopathy, but it will start getting better soon.