This shooting happened in Florida, and in Florida and most of the other 48 states (if not all of them), shooting a fleeing petty thief testing to see if you left your car door unlocked as he runs away falls somewhere along the assault with a deadly weapon to attempted murder felony crime range, and is a far worse offense than what the criminal himself was doing in the eyes of the criminal justice system.
There is an old saying attributed to the Spanish general Gonzalo Fernandez de Cordoba:
Enemigo que huye, puente de plata. (At a fleeing enemy, the Silver Bridge.)
We are predators (even if some among of our species do not behave like that) and as predators we are hardwired to chase and take down a prey that runs away. If we add to that the Ego’s need for retribution of offenses, we end up with a volatile mix that will end us up in jail.
We need to mentally train ourselves to fight both instinct and Ego and give a retreating jackass his “silver bridge,” to let him escape. We are not conducting combat operations, nor we are fighting a dedicated enemy so the chance of seeing the bad guy again are infinitesimal. Plus we have all the laws that say it is a bad thing and you are gonna get orange rompers and a free stay at the State’s Pen for playing that game.
You come out alive at a bloodless confrontation? That is more than enough reward. Trying to score a head for your mantel is just unnecessary… and tacky.