Context: A few weeks ago , my family and I went on a little family vacation for a couple of days . I accidentally left the front door unlocked . No one panicked , though , because we live in a relatively safe neighborhood and our neighbors all know each other .

Question: What may be the reason they usually lock the door even though they live in a safe neighborhood ?
Options:
0. They have pets that might get out .
1. There have been break ins lately .
2. It sets their mind at ease .
3. None of the above choices .
Answer: 2