I think the person primarily at fault, from a moral/ethical standpoint, is the armorer or whoever else was deemed responsible for handling weapons on the set. That's common sense, right? If you were to divorce your politics from the situation and just look at it straight, that's the common sense take.
The fact that it's an actor you viscerally hate because of politics shouldn't change your estimation of what happened, but it does because you are fully deranged by cultural and political allegiances and conflict.
I think it's absurd to expect an actor to understand what is going on with the guns. I wouldn't expect Joe Actor to be able to visually tell the difference between a projectile round and a blank. I wouldn't expect Denzel to be able to fly a 747. I wouldn't expect Ryan Gosling to be able to change the spark plugs in a Mustang. They're actors in a world of pretending and make-believe.
It's someone else's job to the change the oil. It's someone else's job to prepare the props. In his role as actor, Baldwin did nothing wrong.
Regarding his role as producer, I have no idea what the actual authority structure was and his involvement in any of those decisions. You don't, either. You have what you WANT to believe because of your aforementioned political and cultural psychosis and fury.
I don't even like Baldwin. I think he's annoying personally. I would rather spend an evening drinking storm runoff out of a culvert than watch SNL. He's been in some amazing movies. He was hilarious in 30 Rock. Whatever, don't care about him.
I've spent my far-too-lengthy life around guns and gun users/owners so this "I DUTIFULLY CHECK EVERY WEAPON I AM HANDED WITH A 20-POINT SAFETY INSPECTION!" is complete horseshit. I've been hunting too many times. I've been shooting too many times. I've been in the back of a buddy's truck heading out to drive the property too many times. I've been to too many competitions (obviously standards are very good at them). You idiots can sell that shit somewhere else.