Yes I do answer the door, and have enough confidence in my own judgement at 79 to decide whether to smile and invite my friends in, or send them packing. Have never had any problem, but sometimes the caller gets more than they expect. Various occasions come to mind. Once when a Jehovahs witness came to the door and began to quote from the bible, he was unlucky enough to find my sister, (who has that ability to retain word for word thing) correcting him, and informing him that he had missed half the quote and thus changed the actual meaning . He looked a bit taken aback, tried another quote, which she again told him it was only half the actual quote and then he beat a hasty retreat. Another time when I just did not trust something about this particular person, and so I asked him which was his best side, as I already had a photo of him as he came up the path!! There have been many people in many countries but I can say truthfully that I have never felt afraid to open the door so far. It doesnt mean I am too trusting, and as others have said I always have the door locked if doing something upstairs or usually lock the door once it is dark, in the winter, but have a light that comes on with movement anyway.