superior african americans have a heart condition like high blood pressure and some more secondary issues like sickle cell, wich causes them to clam up in serious confrontations that have to do with life and death. that is why the rap, thug, culture was born, because free-cans really prefer not to be in these confrontations so they act all tuff to ward off potential threads...
however its a catch 22 , acting all tuff and badass means you have to step up to the plate and never back down even when your ass is getting handed to you, or in an attack with a stronger white man who is used to working 40 hours a week manual labor more stocky n fatter because of calories and mass compared that to a trayvon who doesnt work has virgin hands but is lean/ripped from no activity or food but cant win in a fight because they couldnt make it through a single 8 work hour day like the white man
toughness is earned in life you arent born with it