So he basically should have let Martin pound his head into the ground. Got it.
Or he should have just let crime riddle his neighborhood and not cared, because it wasn't his stuff being robbed. Got it.
Marty? Have you ever heard of the concept "Personal responsibility." I'm only going to make this point one more time, and then I'll have to lower my perceptions of your IQ several points.
GZ has no regrets. That means he learned nothing. That's not a healthy, sane way to go through life.
What happened that night was undoubtedly the worst thing that happened in his life. Far and away, the worst.
And he is so narrow-minded, that he honestly can't see that he could have done it any better or different.
This isn't Monday morning quarterbacking of what happened that night. This is him looking back and saying "I could have avoided imminent death had I made some different choices - but meh! I'd do it all again."
That's either stupid or psychotic, or both.