That's why producers employ expensive specialists who only exist on set to assure and enforce gun safety. It's a completely normal procedure all things considered, as many people rely on proper work by those who handle dangerous goods every day all the time. I get your feeling of unease, as especially germans are very sceptical when it comes to gun use in general, but being an active sports shooter myself, I see many other comparable situations in a lot of different industries. Once you consult/employ an expert, what more can you expect? If I book a flight to wherever, I expect the pilots do work properly and assure my safety, so my life lies in their hands. Human failure is part of general risk of our life.
"While the exact type of weapon used in the shooting on the set of "Rust" remained unclear, an affidavit filed by New Mexico authorities on Friday said the film's assistant director grabbed one of three guns placed on a table by the armorer.
The assistant director took the gun to Baldwin, handed it to the actor and yelled, "cold gun," in an indication that "the prop-gun did not have any live rounds," the affidavit said."
Can't see any negligence on Baldwin's part so far. Judging by german law and assuming there's not too many details left out so far, he wouldn't be punishable by criminal law and he wouldn't be liable by civil law.