Shower thoughts on the last of us:
Ok so I see a parallel between the situation with ellie and the fireflies and the situation with the army guy that ultimately killed sarah in the first episode. In both instances, we're looking at utilitarianism, or basically 'sacrifice the few for the many'. My personal opinion is that the fireflies are doing exactly the same thing as the soldier, just in a more sanitized way.
In the first episode, we spend time with sarah and we feel her fear and innocence and when the soldier shoots her because she might be infected and it might save more lives, i think we collectively see him as the bad guy, or at least the one who carried out a bad order.
By focusing on joel throughout the scene where the fireflies virtually kidnap ellie and take them to the hospital and prep her for surgery, we avoid the same feelings of helplessness and fear and anger that we know ellie would be feeling if she were awake and cognizant. I think this is the biggest difference.
And maybe you agree that utilitarianism is the best thing - sacrificing one person to save the world seems a small price to pay when you consider how many people have already died. Personally I don't agree with that, but to each their own.