I think genetics pays some role in size. What I mean is you just happen to be genetically larger than your peers you learn early on about might makes right, which would then let you be aggressive as other people realize you have a size advantage. Sure there are some born with predisposed mental issues. Other than that I think a lot has to do with environment.
Fate whispers to the warrior, "You cannot withstand the storm." And the warrior whispers back, "I am the storm."
Women and children can be careless, but not men - Don Corleone
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