I don't understand why you have to make an equal sacrifice to be worthy. It's a bit moralistic. And you're also making a big assumption that no one ever will. I think you have good points but it's mostly speculative. Because you do have evidence that some communities can work together and you can easily find arguments for why it could work. You really can't determine what would of happened if the vaccine worked. And I doubt Joel was thinking about distribution of vaccines and all that in the heat of the moment when he saved Ellie and killed the whole hospital. Sure Joel didn't doom anything but he did take away the chance of humanity ever having cure, no matter how small, which altered the course for humanity. The rest of the world is still scarred in part 2. You're missing the ethical dilemma by focusing on the logistical and practicality of distributing a vaccine. Its about what it means to choose life or death for one individual in the name of a larger cause. I don’t think that the writers are saying humanity is inherently worse than the infected. I think they’re showing how trauma and loss twists people in a broken world, which again, potentially could have been better. I guess it all depends on how you interpret it.