Lead was used in paint up until 1975 when the Romans knew it was toxic way back in those days... When we can't learn from our history, we're bound to make the same mistakes over and over again. I believe that it's by design to control us. It's like going thru life with blinders on, oblivious.
Yes, it's all about control.
Locking the knowledge into monasteries helped the control freaks dumb down the population.
We are just now starting to overcome that deficit with the interwebz.
Maybe this great reset will wake up enough folks to the control grid that we can overcome those that seek to control and experience some freedom.
The library of Alexandria, i.e.