I leave all my vehicles unlocked when they're at home and parked overnight. No point in making them damage the paint to pry open a door or bust a window to get in. Where I live now I've not had any problems whatsoever over 10 years but other places I have lived people or kids like to get into cars and go through the glove box or console or look for cigarette money or something. People stoped stealing stereos decades ago.
I had someone try to steal a 87 S10 Blazer back in 2000. It was an old beater and probably the only reason they were trying to steal it is because they knew they could. You can steal one of those with a pair of pliers or a hammer and a screwdriver.
Has a weird twist of fate they had it already stolen and all they had to do was start it and drive away but they didn't. That was the one night that my son got hurt bowling at 4 years old and I had rushed into the emergency room to get stitches. I called my wife around 3 a.m. or so to let her know and she turned on some lights. Perfect timing to scare them away.
And it today most people break into cars are just pumps that are looking for something of value so I don't leave anything valuable in cars. If I have a firearm with me it will be with me. I have only left one in a car once or twice on very rare occasions due to government building or somewhere I reallycan't carry inside involving Federal or felony violations.
These punks don't know that how to actually steal a car, they can only break in. If a professional wants your car, he will have your car. Or they'll just take the whole vehicle like the tow man does.