We had a relative who lived out in the middle of nowhere in our county and never locked the house.  This was back I believe in the early 60's.   Someone who was quite drunk got in a car accident near his farm and walked to the house.  Anyway, Elliott was awaken by a drunk covered in blood when who turned on the bedroom light looking for help.   They locked the doors after that and my folks always used that story as a reason why we had to.