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Keeping car and house doors locked also helps keep good people from advancing too far when making innocent mistakes.

I was once visiting someone I met for the first time at an unfamiliar apartment complex. They had requested that I put some items in their car and I mistakenly put them in someone else's unlocked car. The mistake was realized before the owner noticed, but the situation would have gone better had the car been locked.

Another example would be a visitor walking into the wrong house by mistake, which could quickly turn tragic. A locked door would make them either realize their mistake immediately or require them to be knock.