Again, I'll simply the legal primer on this matter.
In most all US States you can only use deadly force to counter deadly force. In the home, the burden is lessened - in robbery situations, you are not expected to ascertain that the intruder actually has a deadly weapon before you fire on him.
In almost all states - with there being some specific exceptions in TX and LA - you cannot fire on a fleeing felon. Even if you think the CPU he's carting away *is* a threat to your life, you cannot use deadly force to simply protect your property.
This explains one of the examples. The letter-slot knife example is one I'd have to investigate further to be able to explain.
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