I think the big one is that he claimed "he didn't pull the trigger" where FBI confirmed that the gun was fine and he pulled the trigger. This is basically him lying under oath.
I wonder if he honestly doesn't remember doing it? Most people would feel a lot of guilt if they accidentally killed someone and we are pretty good at lying to ourselves, so maybe his mind is protecting itself from feeling too much pain?
Sure. And whether or not he was involved enough to be responsible will be decided at trial. Look, as I said, whether or not he is could be argued and you are proving that; we'll have to see how the trial works out. My point is, it isn't as cut and dried as the union is trying to make it sound.
You don't need to be an expert to not shoot somebody. There are four basic rules of gun safety, and you can memorize them in a matter of minutes.
Honestly, I entirely reject the idea that actors are not liable to learn basic firearm safety if they are going to handle guns. Industry standards be damned, responsible adults have an obligation to know what they're doing before willingly entering a potentially dangerous situation.
Do you follow the 4 rules every time someone hands you a Nerf gun? What would happen if someone handed you a gun disguised as a Nerf gun and you shot and killed someone with it? Would you be at fault? No, you didn't know it was a real, working gun. Whether you agree with the reality that the guns used on movie sets are a combination of real guns, decommissioned real guns, and straight up prop guns: if someone hands you a gun and says "This gun has blanks in it" and you shoot and kill someone with it... how would that be different from the disguised Nerf gun scenario?
Well, a Nerf gun is a toy and a gun is a gun. If someone hands you a gun disguised as a toy, I agree that you shouldn't be held responsible for accidentally shooting someone.
However, I don't think that comparison tracks for guns loaded with blanks / deactivated firearms / prop guns. Pointing something that has any reasonable chance of being a not-disguised gun at someone and pulling the trigger is something you should refuse to do.