I have developed this habit as a redundant safety. Whenever I need to dryfire any firearm whether it be to dissemble it, check the trigger pull or whatever I use the sights. Why? Just in case I somehow overlooked a round in the chamber I will be aware of where the bullet will go. When you sight at something that you know will stop a bullet it adds another layer of safety. If I am outdoors it is usually the bottom of a large tree right where the trunk meets the ground. Inside I aim at the baseboard where corner of the floor and two walls intersect. Plenty of lumber there to stop any common handgun bullet or at least direct it into the unoccupied crawlspace under the house.
Maybe I am being overly careful but if it can happen to Bill Jordan...