They were filming in a state that has a law specifying the exact opposite. “I thought the gun wasn’t loaded” is codified as not being an excuse for a negligent shooting and there isn’t a “it was a movie set” carve out to the law. Hollywood also seems to be extremely split on this with some actors saying you always check and take personal responsibility and others saying to just trust what you are told. If anything hopefully this will lead to actual best practices being adopted industry wide because the current hodgepodge isn’t cutting it.