I do know that actors take classes learning how to handle firearms. That have to act competent when shooting. Why wouldn’t they know anything about safety and firearm handling. It’s quite apparent that Baldwin is a cluck but he is a veteran actor and should be expected to know quite a lot about firearms. At least that’s the way I see it.
Again I can’t say what exactly happened on the set except he shot an innocent bystander and wounded another. That’s a fact.