Always have, always do.
Many years ago, about 9.30 ish one summer evening, all my young children in bed, hubbie was driving my parents home, bell rang.
Two youngsters (about 15 o 16 year olds -both so much bigger than me), were on my porch asking to come in to use my phone (years before mobile phones). They told me that they had been chased by a gang of skinheads, and needed to phone their parents. In my head I went through a scenario where I was telling the police I had let these two into my house, etc.etc.
I asked for the telephone number of one set of parents, then left them on the porch and went back in to make that call.
Yes, they were telling the truth, and I brought them in to wait for parents to turn up. They told me they had tried umpteen front doors and I was the first one to answer.
Many years later, after I was retired, one November dark night my front door bell was run at 9.00 pm. I was too curious NOT to answer, opening my front door, and it was a Community Policeman trying to ensure that we 'oldies' all knew how properly to lock our doors and windows. I was furious with him coming at that time of night, especially as when I first opened the door and saw him on the other side of the porch door in his uniform, it brought back a total recall of the time so many years earlier when a policeman had called to tell me of the death of my youngest child!!
Following day neighbours were all saying about someone ringing their bells so late and none of them had opened their doors. I made a formal complaint to the local police station and did receive an official apology = evidently they had not realised that he was going house to house so very late, and he did not realise how frightening he had been by ringing front door bells of elderly people so late.