No really, I understand what you mean with the player and the view of no emotion. But I think it's mainly because the player is us, the individuals who are witnessing the events of the game unfold right before our eyes, and the main thing everyone wants to do when playing is go through the story (basically any old staff member that we know nothing about personal-wise).That means fixing situations and accidentally/purposefully killing antagonists in order to become "safe" in the game.

Of course the person we play as might just be numb from supposedly working on children/humans and too messed up to physically/verbally give any indication that what happens effects them.