Do you lock your doors?

I have always lived in a city, and I have always locked the doors to my house and the doors to my car whenever I am away from them and when I am in them. I can’t imagine not locking my doors.

I have met a few people who live in the city and never lock the doors to their houses or their cars, even when going on vacation or when leaving their car in a parking lot. And, I have met more rural dwelling folks who do not lock their doors.

So do you? Either way, I’d like to know why.