Comment: Could it be caused by "natural hormones'?

Maybe some of them don't start as psychopaths but something changes inside them on their rise to power?
A bit of barnyard biology.
It is well documented that as animals become high status in a dominance hierarchy their level of testosterone increases (both males and females). It is also well documented that higher levels of testosterone are associated with more violent behavior. I don't know if higher levels of testosterone lead to paranoid behavior as well, as it is difficult to measure a chickens level of paranoia, but I would imagine it would.
I don't know for a fact, if the human hormone system reacts similarly but being very social creatures with a formal social hierarchy, and noted for their intense pursuit of status, one could suppose they would.
I could imagine that most high level politicians probably started with a higher than normal level of testosterone and the closer they get to the top the higher their levels of testosterone rise, leading to aggression, and maybe even paranoid behavior.
Could this also be a partial explanation for the propensity of leaders to go to war?