The only time the nigger even stepped back is after the nigger seen the gun. It's too late then, because draw and fire. It's not draw and wait to get your head stomped in or some other nigger to jump in. a gun is not a scare someone prop.
He was perfectly justified in killing the nigger in self-defense. However, it's a boomer move to try to talk to niggers, while the niggers are doing something illegal, like parking in a handicapped place. Niggers are subhumans, so they are not going to say, "oh my mistake" and move. The niggers will always escalate everything to violence.
It would have been best if he just walked by those filthy niggers and said nothing. It is always best to avoid a fight, if possible.... and everything with a nigger ends up in a fight, so avid niggers means avoiding problems.
After the collapse and there is not law, then do whatever will be needed.