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In short, I do not think that deadly force is justifiable for anything short of a personal defense scenario. The importance of property is always second to the importance of life.
Let me clarify; if someone, without harming you in any way, takes your stuff and gets away, deadly force would not have been morally permissible to prevent it. Same with a purse-snatcher; they grab, run, and never were a danger to you personally. Using deadly force against such people is immoral and illegal even if not to do so results in your losing property.
The line is crossed when, for whatever end, your life and safetyare personally threatened. This MAKES it about personal defense, even if the situation did not initially threaten anyone's life or safety. A burglar, confronted by you, has the option to fight it out. The moment that decision is made you are no longer defending your house; you are defending yourself. Between the confrontation and making the decision, you can use the THREAT of deadly force, but if the burglar tries to escape or surrenders there is nolonger a reason to shoot.
The argument can be expanded to include situations in which neither you nor anyone around you is threatened by a hostile action, but if the assailant succeeds the net result would undoubtedly harm someone, even if you don't know who. For instance, an escaping violent criminal, if allowed to get away, will undoubtedly cause harm to someone else either in furtherance of their efforts to get away or simply when they resume the criminal activitiesthey werelocked up for. It can therefore be justifiable to shoot to kill when the prisoner is encountered even if the prisoner poses no personal threat to you or anyone in the immediate area; they will inevitably pose a threat to someone else.
This can, in those broader terms, come back to property. You own dangerous property: firearms first and foremost. Someone breaks in and cracks your gun safe, but you hear and confront him. The burglar cannot use the weapons he's trying to steal because they're unloaded and breech locked, so he tries to flee with what he has. You now are faced with a moral dilemma. If the burglar escapes, he willdefeat the breech lock and will eitheruse the weapons himself in the commission of furthercrimes, or will fence them to people who will use them. This is practically inevitable. If, however, you shoot him and he dies, you were never in any danger and theshootingwould not bejustified as necessary to protect your own safety. The question, on which there is book and case law going both ways, is whether the shooting is justifiable based on the inevitable harm to others had you not stopped the burglar. Many jurisdictions say no, because nothing is inevitable. The burglar could be caughtthat nightand all weapons seized and eventually returned. The burglar mayditchthe guns as being more trouble than they're worth to offload. Other jurisdictions say that shooting in such a case, though it can neverbe legally required, is justifiable as the consequences of inaction are easily foreseen and the burglar, by stealing and inevitably fencing the weapons, poses a danger to otherpersons unknown.
Morally,shooting a gun thief isequivalent to a train coming down a track and five people are tied to it. You stand at a switch; if you flip it, the train will change tracks and kill just one. The net difference is four lives. By many consequentialist theories, the morally required action is to flip the switch and kill the one person. But, that assumes you know, without a doubt, that five people will die if you do not act. It's highly probable that you AT LEAST break even, just like it is highly probable that if the gun in his hands were loaded he'd use it on you and someone wouldn't get out of that room alive. However, the weapon in his handsposes no IMMEDIATE threat to anyone except as a club, so your justification for shooting him is largely based on you claiming to know the future.