system
A chat on subreddit /r/NoStupidQuestions
human
Alec Baldwin ( he was the producer) was allowing employees to shoot the gun, with live ammo during breaks.

Both The armorer and Balwin are at fault for the death. 

The armorer is at fault for failing to do her job. Alec Baldwin is at fault for creating the unsafe work environment, not double checking the work of the inexperience armorer, and pulling the trigger.
gpt
This is incorrect. Different types of producers do different things. His job was overseeing casting and scripting.