Let me try to dumb it down for you.
This was a movie set. They use props in movies, including guns, for authenticity and actors do raise, aim and fire weapons once the gun has been cleared by the armorer. And there are dozens of people on a movie set so there's danger to both cast and crew, regardless of aim, if the armorer screws up (like in this instance, where the gun had a live round) or there's otherwise a breach in safety protocol.
The armorer in this instance made the weapon available for the scene, the assistant director shouted "cold gun" and handed it to the actor for the scene, and the tragedy followed.
You have no idea what he was aiming at because that fact hasn't yet been publicly disclosed. The scene may have called for him to point the gun in the direction of the camera, which could explain why the cinematographer and director were hit, but that's pure speculation at this point.
You won't back down from your "Baldwin's a killer" nonsense because he's parodied a guy who you worship. With the possible exception of Lucy, you are the most disingenuous and ignorant poster on the board.