Well, I see a couple of problems with less lethal.
1. Less lethal can still be lethal on occasion, this means you typically can't use it unless you already meet all the criteria for using lethal force. So now you are in a situation with an immediate threat of death or serious bodily injury; but you are using a load that depends mostly on the psychological choice of the attacker.
2. Police who use less lethal are wearing body armor, have training in its use, and are backed up by a another police officer in body armor who has lethal force ready. Most homeowners don't have that level of preparedness.
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