saw this
If the giant football player initiated violence against some neighbor talking at him, insteasd of leaving  and/or telling him to f-off,  does he not expect self-defense with whatever is handy when he attacks said questioner? 
The football player had behavior problems at school; came from a broken family; not surprising he should be impulsive and violent.  The shooter was nearly killed by the brute who attacked out of paranoia.  GZ is a hero.  Evolution wins.