Not so much the use of lethal force in situations of protecting property in almost all cases, but rather that, as suggested by others, if one has to confront burglars, vandals, or arsonists, on their own property to defend their property, they should be armed. If someone is trying to get into your shop, you shouldn't be picking them off at 100 yards in the dark. But if you must protect your property, you would be a fool not to be armed in case the potential criminals tend to be a bit violent. Even if all you want to do in your heart of hearts is to get their license plate number, THEY might make the decision to silence witnesses, sometimes a bit more permanently than others.
In ND, you can use force to defend property, not lethal force. Presenting arms in self defense, or in defense of property is force. Shooting is lethal force. Greeting people on your property while carrying a gun is no problem, pointing a weapon at a burglar is legal, but not shooting them. Unless, of course, things go south, and you have no choice, and it goes from defense of property to defense of life and limb.
Every man has to not only know the law, but also know his own personal values and what he wants to risk, what is the value of these things at stake. Its the reason why thinking about these things is important, because its better to think now than do your "thinking" in an adrenaline rush when it might actually happen.
Urban dwellers have better options. But, as in the case of the headlamp investigation noted in this thread, it brings up the other interesting question of when are things so minor, trivial, that you don't call the police? When is there i minor situation where someone might feel the need to look into something, investigate it themselves, but not bother the police? When and where is it excessive to call 911 for every little bump in the night? When should things be left alone, handled by yourself, and called in?
Also, the duty to retreat isn't just a good legal aspect, it is smart tactics, unarmed or armed. If the man hadn't chased the suspects, he would have avoided a terrible physical assault. When is tackling, and physical restraint of a suspect, a good idea, and when is it best left to the movies?