He pointed a weapon at someone and pulled the trigger. That's weapons safety rule number 1. Treat every weapon as if it were loaded. He blew every safe weapon handling rule HIMSELF. This is on him. Blame game doesn't cut it.

That's crux of the matter, isn't it? The answer any safe gun handler would say is, "No".
What was live ammo doing on a movie set anyway?

That is how an idiot checks to see if its loaded.I'm surprised the idiot didnt look down the barrel and pull the trigger to check.

First thing you do when someone hands you a gun is to check/remove the magazine and clear the chamber.
Pointing any gun at any body part including your own is rule one in safe gun handling.

Still have not heard anyone explain why a real gun is ever used in a movie

Boco said it right. Any time a gun is handed to you wheter told it is unloaded or not you should check it.There is guilt on the part of Baldwin here as well as those that handed him the gun.I smell a rat here, why would a live round been there?