Killing someone just because of the shock value rather than an actual need for the story to progress is not the same thing.what naughty dog did was just for shock value and nothing more than that.they wanted to be the edgy kid in the class.if you want to tell a depressing/dark/post apocalyptic story then learn something from dark souls.
Also you should rename it to a movie.very less gameplay just more like an interactive movie.worthless to even call it a game.