The environment defintely plays a big role in how a person is. The first 1-3 years of life are the most important in shaping who you become, and if a child is neglected and doesnt get love & nurturing during this time he might never grow into a healthy person. even when the baby is in the womb, if the mother doesnt take care of herself it can effect the baby's development
also a person could have a personality disorder like antisocial or narcisstic which makes them just a mean & uncaring person, but all coming from how they were raised
and that's very true about defense mechanisms. people will project feelings of their own hatred onto others, this is how racism or homophobism starts
i could go on & on this stuff fascinates me...sorry lol ...ima psych major ..ive written tons of papers on this kinda stuff
