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We usually know when someone is coming over or if we ordered pizza.
My son is too young to have friends coming over to ask if he can come out to play.
We have no family in town and before they make the 5 hour (minimum) trip here we always know in advance.
All that is to preface my stance/opinion on this.

If I'm not home or sleeping (work nights) the wife will look out the peephole and if she doesn't know them the door stays shut, and she has her G26 with her.
If I'm on days off and the one answering, I have a pistol on me and check the peephole and if I don't know them the door stays shut.
I don't want to waste my time with all the salesmen/women we have (and we have a bunch of door to door sales in warmer months).
I'm adding cameras all around my house that will be on a recording device and viewable on my laptop or phone as I'm in the living room, etc.
I already have non-monitored alarms on the doors, but I'm looking at a new system for doors/windows/motion that will alert me via phone first, then I can call if I want some of my fellow officers responding.
My 2 dogs are starting to come around as watch dogs (barking, alerting us) but not attacking anyone.
I've had death threats made against me at work by gangs, drug dealers, murder suspects, etc, and they are taken seriously. If I answer the door they will be face to face with me and I don't know who else is lurking, and they will confirm this is my residence.
My name/addy isn't published but that is not a 100% guarantee of anything, so I'm watching out for me and mine.
Some will say its paranoid, I think its just good practice.