Yep. I grew up not ever locking our doors, and I still don't. I even usually leave the keys in my cars in the driveway, especially in the one that the neighbors all know they can borrow if needed. I do have a dog who will bark when anybody unknown approaches the house, though.
When I lived in the city for a few years, I did lock my doors, but I left my car unlocked. I would relatively frequently come out to the car in the morning and it was obvious that somebody had rummaged around in it. But I didn't really care, and it was better than having the windows smashed, which did happen in that neighborhood.
A day later the car was broken into again. While the lock was still broken and no stereo in the car. Someone smashed in the side window and left the door ajar too. Nothing got stolenthat time around.
What’s awesome is living somewhere that crimes of opportunity don’t even happen. There are still places where people don’t lock doors because they don’t need to.