WHY didn’t Alec Baldwin first check the chamber of a weapon handed to him and why did he aim it at a person and pull the trigger?

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Don’t liberal democrats know or understand gun safety at all? The NRA and conservative gun owners know and preach these practices all the time.
WHY didn’t Alec Baldwin first check the chamber of a weapon handed to him and why did he aim it at a person and pull the trigger?
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