There were many points of failure but just because a lot of unsafe idiots contributed won't absolve any of them from blame. Blame mostly lies with the incompetent armorer 'expert,' the person in charge of hiring the incompetent armorer, whoever allowed the guns to be used with live ammo and whoever provided the live ammo, and yes ultimately Baldwin himself as the actual shooter.
Using the airplane flying, skydiving, or HVAC examples, I don't think they are good examples because those require a special level of highly technical education and certifications and experience. Those skills could not be taught to a 10 year old in a short period of time. Yet, still, let's run with these examples. If you were an actor doing a parachute scene and the 'expert' you would still probably look over the pilots shoulders and pay attention for anything amiss, and you would personally feel and inspect your own parachute harness looking for anything amiss, would you not? I don't think these are particularly good examples.
With firearms safety it's different. A 10 year old of average intelligence could be taught how to inspect a gun for ammo. It appears the gun he was using was a very simple single action cowboy gun with a loading gate, and 6 cylinders. It would be very easy to check it for live ammo, even if one had to remove each shell to ensure it is a crimped blank and not live ammo. Better still, a policy should be in place that 2 persons, the expert and the actor, must observe the loading of any gun with blank ammo, both confirming verbally it is blanks, and then that gun never leaves the possession of the positive control of it and if he loses positive control the process must be repeated. If a child could be trained to do something like this, Baldwin surely could do it and should have. Why? So this exact type of tragedy is avoided.
We are not talking about some abstract painter artist who never handles guns and has a childlike understanding of them. Baldwin, by the nature of his business directing an action film and having starred in them, seems to demand a higher level of competency here. I like Baldwin as an actor, and he's been in many action films involving firearms including The Getaway, The Hunt for Red October, The Edge, The Departed, and others. The very NATURE of his profession seems to demand he have a professional responsibility to be familiar with firearms safety. PLUS hire competent trustworthy people to be set experts.
Here's a better analogy. If I were an actor staring in many high speed car chase movies, and then a director filming a movie involving high speed car chases, which I star in, I'd certainly hire qualified experts on such things. But I also would not blindly trust my experts who tell me the city streets are blocked off and clear for a race thru London. I would personally go look, probably slowly drive the course to ensure the roads are blocked off, there are no pedestrians are in the roads, no obstructions, etc. That is about the same level of difficulty as what we are talking about here.
Firing into a clearing barrel is not a good solution because the gun presumably would have been loaded with blanks.