I also grew up around guns* and wouldn't expect an actor, someone who spends their working day immersed in fiction and special effects, someone who pretends to do all kinds of things from the most mundane to the impossible, someone who is surrounded by people whose job it is to do everything for them that doesn't involve acting, people whose job it is to make sure everything is comfortable and safe for them so they don't have to worry about anything but pretending convincingly, to be held accountable for eff all when handed something and told it's safe.
Because the actor potentially hasn't grown up around guns. Anyone handing a gun to an actor should always assume that the actor is an ignorant moron.
* I haven't actually fired one since I was a child, (and that's not a joke).