I live in a very safe area, yet I don't answer my door for anyone I don't know. Those days are long over! I'm home by myself quite often, and our door can't be seen from the street, so I just don't feel comfortable. The last time a man I didn't know rang the bell over and over, I went to the door with .38 in hand and told him "I don't know you, please leave" through the door. He had no way of knowing what I had in my hand, but he left. No one should be going door to door anymore, IMHO.