It's amazing how some people will change once they are introduced to firearms. I'm selective in who I will teach. I one time had a woman come right out and say she wanted to learn to shoot because her husband needed shooting!
Personally, I don't see a problem with answering the door with a gun in your hand, or at the least in your belt. Hinting he might use it against someone is premeditation though, and he needs to know that. You are his friend. Do what you must to straighten his butt out. Tell the knucklehead his girlfriend will probably not even visit him in prison.
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