On the rare occasions that I do get a knock on my door I do have a gun with me when I go to check it out. More often that not, when I look out the peephole it's not someone I recognize (salesmen, folks looking for petitions to be signed, etc).
Typically If I'm not expecting anyone and it's not someone I recognize, I don't even bother to open the door at all. Just look out, decide I don't want to be bothered, and go about my business.
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