If you point a Nerf gun at someone and it fires a real bullet, how are you the ******* for "violating gun safety"? It's a fake gun that should never shoot bullets.
Unless he brought a pocket full of ammo from home and loaded the gun, Baldwin isn't to blame for this. It's a prop gun. It's FOR pointing at people. The entire point of the existence of a prop gun is to be safe to point at and shoot people with. Just like the point of a rubber knife is to be safe to stab people with.
That's like blaming someone for being killed by an exploding sandwich because "hurr, he should have checked the sandwich first, negligent dummy". No, sandwiches don't explode, and you have no reason to ever anticipate your sandwich exploding.
In a century of movie making you can count incidents like this on one hand. It should simply never be a possibility. No live ammunition should ever be on the set, let alone loaded, let alone given to an actor whose job it is NOT to fiddle unnecessarily with props.
The failure here is totally upstream and Baldwin doesn't assume blame because he said some dumb crap on Twitter.
Accidents can happen without live ammo present.
It's what happened in the case of Brandon Lee.
A blank round was used when he was killed, and a round with a live primer, no powder, and a bullet was used prior to that.
From Bandon Lee's wiki page ...
In the film shoot preceding the fatal scene, the prop gun, which was a real revolver, was loaded with improperly-made dummy rounds, cartridges from which the special-effects crew had removed the powder charges so in close-ups the revolver would show normal-looking ammunition. However, the crew neglected to remove the primers from the cartridges. At some point before the fatal event, one of the rounds had been fired; although there was no powder charges, the energy from the ignited primer was enough to separate the bullet from the casing and push it part-way into the gun barrel, where it got stuck (a condition known as a squib load). For the fatal scene, which called for the revolver to be fired at Lee from a distance of 3.6–4.5 meters (12–15 ft), the dummy cartridges were replaced with blank rounds, which contained a powder charge and the primer, but no solid bullet, allowing the gun to be fired with sound and flash effects without the risk of an actual projectile. However, the gun was not properly checked and cleared before the blank round was fired, and the dummy bullet previously lodged in the barrel was then propelled forward by the blank and shot out the muzzle with almost the same force as if the round were live, striking Lee in the abdomen