No, sorry Steve, but you can't expect someone who's never had any training to know this kind of thing. It might be second nature to you, but as you say you're very much a gun fan. I suspect a Hollywood actor could tell you more about the viscosity of a cappuccino than he could about guns, and will likely have only fired live weapons a few times in his life. The studio obviously knows this, which is why they hired an armourer to handle the firearms. That's a whole different conversation however with its own set of questions, but the point is that whilst Baldwin could've very reasonably prevented this from happening, expecting him to do so without adequate training or exposure to firearms isn't realistic at all.