As a Brit is difficult to comment on US Law - probably because I don't know anything about it!
As a former soldier who spent 6 years in Northern Ireland where the locals could be very hostile to us, I can emphathise with the 'gang bangers' scenario. We offered a simple phrase that it was 'better to be judged by 12 than carried by 6'.
What it means is that if you have that right to self defence using lethal force, then have the moral courage to shoot to kill in a confrontation where your life is on the line. Afterward stand up before 12 of your peers in court and say with conviction that you shot the other person to save your own life.