The ends don't justify the means.
If this citizen was justified in shooting the burglar when the burglar pointed his gun at him (and he was; why he didn't I cannot imagine) it is entirely plausible to argue that he was firing at a fleeing, ARMED felon who did, indeed, pose an imminent threat to the community. Pointing a weapon at someone during the commission of a crime, in this case probably a felonious crime, is another felony, and probably justifies shooting at the car.
***GRJ***
In California you may not use "self defense" as justification if you started the altercation. In this case, Bobby was the aggressor. He pointed his gun at the burglars. It was only after they saw him that they pulled their own guns. Based on CA law, the burglars were the ones defending themselves.
When you shoot someone and kill them, the legal term is homicide. Whether or not you go to jail depends on if it was justifiable or not. In this case, it clearly was not justifiable.
Since no one was actually killed, this is clearly a case of
attempted homicide on Bobby's part. He fired his gun in attempt to kill two guys. His shooting was not justified because he started it and they were fleeing when he started to shoot. Therefore, he was not in jeopardy of life or great bodily harm.
Should be he charged? Absolutely! He is guilty, by his own admission, of attempted homicide or at least attempted manslaughter. His carry license, if he has one, should be revoked at the very least.
Should he be put in prison? Absolutely not! That would serve no purpose in this case. A large fine and maybe some mandatory training should suffice in this situation.
If it were me, I would not have presented my gun until they presented theirs first. There is no object on this planet that is worth killing someone over. I will defend myself, but I won't shoot someone for a TV.