Lead poisoning and resulting psychosis has been theorised to cause the fall of Rome and account for the brutality of the colosseum, not dissimilar to the rise in violence in the current US.
Prior to the Sydney 2000 Olympics, they were packing up all the homeless and bussing them out to as far as 100km from the city outskirts.
It isn't just lead that can chemically and medically poison your brain and your minds. There are also other things that are common in our environment that does.
Let's begin with the obvious: COVID. Unfortunately I also suspect that Putin might have gotten a whiff of this too to affect his judgement.
Brain inflammation caused by excess Omega 6 and unsaturated fats. Here is your daily dose of fast and fried food.
Micro or nano particles of plastic from plastic bags, containers, and dinnerware.
Brain inflammation caused by excess carbs and sugars.
Brain damage caused by pollution and smoking.
Brain damage caused by drugs.