When I answer the door, most of the time, I'm "cocked and locked" with a gun behind my butt cheek and struggling to get the dogs to shut up. I have one outside and two inside, and nobody sneaks up on my house. I have neighbors on three sides who also have dogs... so the "dog alarm" goes off if you simply ride down the street. I have motion sensors on outside lights and some other "private alarms" that warn me of people approaching.
I look out the window before I ever even think of opening the door, and if I don't know who someone is, they get to put up their id to the window before I even engage them in conversation.
Now, I used to be a nice, open individual who would open their door to anybody until our crime statistics came out with the illegals invasion into my neighborhood. Our county had 23 murders last year, and 17 of them were in my zip code. Home invasions and gang activity is becoming almost an everyday thing, so I'm giving "strangers" the appropriate screening. If you don't have an appointment, or an invitation, you're at the mercy of the "Castle Doctrine" in South Carolina.
I've been "bum rushed" at the ATM by a vanload of illegals, and all it took to turn them around was racking my S&W .40 cal 4006 behind the windshield... no shots fired, but they were ever-so-close to finding out if they had reservations in heaven.
I also have weapons strategically placed all over the house, since only my son and I live here now (my wife passed away a year and a half ago) and I shoot every weekend to make sure I don't kill the old lady waiting on the bus down the street if I shoot. As an ex-LEO, I know the bad guys are out there... and I handled some of the worst. If they crash my house, they won't be showing up in apellate court. If they break in while I'm away, the dogs have a "special treat" for them.
One of my "nerd" friends is setting up my computer so I can monitor my house from my cell phone, and it will have specific alarms and cameras set up that I can monitor from anywhere. A few motion detectors and I can tell "friend or foe" almost instantly... with a 250-gig hard drive specifically designated to "recording events" digitally.
I'm not paranoid... I'm careful...
...and with the situation in my neighborhood now, I'm almost the centerpoint of a personal "community watch"... cause when I get all the cameras installed, I'll be able to monitor the entire neighborhood from my cell phone...
... and mostly with free software.
WT