I think the logic is that if someone is trespassing on your property you shouldn't have to take the time (and thence the risk) of verifying whether or not the intruder is armed and what level of threat they pose before taking decisive action to neutralize him. On the surface it makes sense, and I can't claim to have researched it much further.
I think we have this law in North Carolina, as well as concealed carry permits, though I'm not sure I haven't been here long.
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