I cannot see how the dreadful law you quoted, which allows a person to execute a robber (not a killer) trying to escape with some property by shooting him in the back, enables that person (the killer) to say, the robbery backfired! The robbery would have backfired if the thief left empty-handed, or got caught up in a gun-fight, or if he shot himself by accident, but for a property-owner to shoot a man on the run, and who is no threat, is nothing less than a deliberate killing carried out in cold blood and without fear for one's own life. That law licences murder ... provided it is done at night time. Why night time? Perhaps the lawmaker realised the shamefulness of the wicked act it was legitimising. Or perhaps it is designed only to protect cowards.
Give me Sharia Law. At least an Imman has to decide the man's guilt according to some sort of process.
If you are a criminal who has not been convicted, you will not be punished, and therefore unconvicted criminals are irrelevant to this discussion. If you are convicted by due process of law, you deserve whatever the law decrees. If you have not been convicted, no-one, high or low, has the right to exact retribution. That right disappeared in the Dark Ages. Or was it the Stone Age?
To my mind, whoever framed that law was advocating Gun Law and anarchy. Maybe he was about to start a vendetta against the poor or the immigrants or something. Or maybe he was a psychopath who wanted to stay on the right side of the law.
I still cannot balance the equation Property = Life, so, in answer to your final question, yes it does matter. If I crash a stolen car and die through my own fault, or because I am drunk, that is an unfortunate accident that prevents justice running its course. If I die because the car is booby-trapped, then the owner will have murdered me. He will have contemplated a situation where an unauthorised person sits in the car and he will then have taken steps to kill that person: intention and act.
Only the obnoxious, retrograde law you have praised so highly can protect him.