I watch a lot of movies and a lot of behind the scenes stuff. It's pretty uncommon for actors to know much about the subject matter. Anyone with any knowledge of a specialty will be able to look at a music scene, or war scene, or aviation scene or whatever and laugh and point out the mistakes being made.
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As has already been pointed out, discussing a scene, rehearsing a scene, blocking a scene are all part of making a movie.
But it is interesting that you bring aviation into it. I have never seen an aviation movie that got the facts rights. Sure, getting some facts wrong in a movie about Normandy isn't going to kill anyone, but it does serve as a useful illustration for the fact that actors can't be expected to be experts and why that task is outsourced to an armorer in cases where lack of safety can get someone killed.
I'm pretty well convinced that your honest self-appraisal is a big part of why people are holding Alec to an unreasonable standard. For example, no one ever suggested that Vic Morrow was at fault for not becoming a stunt expert and assuring the safety of the set in his incident.
Yep, this is part of what a competent armorer looks like...
So which is it? First you mocked me for thinking that actors were doing things when they were pretending. Now you're saying they are doing things?
The armorer had a job to keep the firearms safe. It's a specialized skill and one that requires a dedicated person (or team in some productions). She handed Alec a gun that he had every reason to believe was safe. Tragedy happened. I still haven't seen a convincing argument that actors need to become subject matter experts. There are *always* subject matter experts on set when safety is a concern. There are frequently subject matter experts on set even when the worst thing that can happen is simply getting the facts of physics, or music, or a historical event wrong.