Likewise, the crime wave of the 70s in the US has been directly linked to leaded gasoline putting lead in the air, and leaded paint. You can map the crime wave literally block-by-block to correspond with areas that have not done lead mitigation efforts or those that have.
Also makes you think about the pathologically evil governmental policies the older generation have enacted, and how those people have also been influenced by lead in the air.
I’m of the understanding that lead poisoning effects the ability to engage in theory of mind (thinking about what someone else is thinking— also, empathy) and future planning, consideration of consequences, first before influencing other mental faculties. Which is why it can be linked to crime so easily.