I grew up in Chicago many years ago. Our front door had a small diamond shape glass at the top that was frosted. No way knowing who was there without opening the door. It didn't have a peep hole for quite a few years. If the doorbell rang we just opened the door. Of course that wasn't at 2 am either.
But that habit of opening the door has stuck with me all these years. I don't have a door bell camera. But my current front door does have a small square glass insert near the top where I can see who is there. And I have hardened my doors where you just can't kick them open easily.
Still I had a storm door with glass where between the two doors I felt I would have to practically shout to have a conversation between the two doors without opening my main door. And an all glass storm door isnt very secure. So recently I changed my storm door to a Larson security glass storm door.
I lock the storm door at night. Now I can open the main door and still be relatively safe as you can't just smash the glass and open it. You can't yank on it and open it easily either. I can talk with a raised voice vs yelling. Somone makes a move to try to open the storm door, I can slam the main door and lock it and call the police. And of course arm myself if I am not armed already.
Yes I realize still not as safe as if I had a doorbell camera. And I will probably invest in one in the near future. I haven't had anyone at night ring my doorbell. And not often during the day the times I am home either. I don't live my life in fear, but still try to be safe. It's a shame really that we have to be fearful of opening a door when the doorbell rings. But I realize times change and I must change with them.