The steps we take for our personal safety are often a result of things that happened in our past - good or bad. People who are fortunate enough to have never been victimized are usually the ones who don't lock doors & windows.
I never thought about it until a 2:00am break-in several years ago. I just went to bed with the TV still on, he opened a sliding-glass door & I heard a grinding sound which later turned out to be a knife cutting the screen. When I armed myself & walked into the hallway, he ran out as soon as he saw me (or...saw the gun & flashlight pointed at him). On the way out, he bumped into the glass door, shattering it. He must have cut an artery because he left so much blood on the ground, when the police arrived, they assumed I shot him.
One thing I thought about often: There were 4 cars in the driveway & he could see the TV on & a few lights on. So, he KNEW there were people in the house & I can assume he was prepared to deal with them....or, perhaps he wanted people in the house because he wanted to hurt people. A typical burglar prefers no one to be home.
Well, more-secure doors, better locks, & a more-powerful flashlight came soon after, plus an alarm. And, I also sleep with my bedroom door locked. And NO windows or doors open.
Go ahead & call me paranoid....doesn't bother me a bit....in fact it amuses me - as much as those who say "No one needs to own a gun."
ETA: Since I hear "We live in a nice area, so we're not too concerned," I'll add something about where I live. (I usually don't because some people misinterpret it as bragging).
I'm fortunate enough to live in a "nice" area. Many of my neighbors are big celebrities. After a home-invasion robbery next door in which an elderly couple were beaten & hospitalized, the occupants moved out & the owner of the home (who is owner of an NBA team) sold the house for 5.8 million.