Learn what "you shouldn't have left the door unlocked" means, when people say it, and how to use it naturally in English.

It means the speaker thinks the other person made a careless mistake and is responsible for the problem.
From Conflicted Hearts, Episode 46
The speaker blames someone for leaving a door unlocked.
Use this to blame someone for not locking a door or for causing a security problem. It can sound accusatory, so it is common in arguments.
Scenes unlock real expressions as you watch
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