As far as I'm concerned, if you have the right you have the right to delegate that right. While I generally disagree with shooting to protect property, if you have the right to shoot to protect property you should also be allowed to delegate that right to someone else.
Yes, I personally agree that deadly force should only be a legal response to deadly force directed at an individual. In Colorado, that is attempting to murder, attempting to rape, and attempting to kidnap. Attempting to steal or destroy is not (unless it is done during a home invasion and a person residing in that home feels they are in personal danger - "residing" means an owner, tennant, or invited guest). I find all of that reasonable.
You don't count arson of an inhabited building?? (Oddly enough, Colorado law seems to consider this an acceptable form of defending property.)
Also, only murder? Not serious bodily harm? (Checking the law it seems to allow lethal force against serious bodily harm.)
As for burglary--that's not shooting to protect property. That's not requiring the shooter to attempt to determine if they're just a thief or they intend more. Home invasion is already serious violence, you know they're more than a thief.