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Rick: in general, the use of lethal force is warranted to protect human life. A mechanical device cannot have its life threatened by an intruder, therefore it is not protecting its life since it has none.

No one, especially Charles, is arguing that your wife should not protect herself by whatever means necessary, up to and including lethal force, from an intruder in your home. I know Charles, and shoot with him, and I think I have a good idea about his opinion on that subject.

There are two points here, one being that "non-lethal" devices may, in fact, be lethal under some conditions, and the other is that lethal devices may not by long-standing legal precedent, be deployed by traps or other automatic means. That's all.