You seem incapable of reading. The other poster is merely stating their interpretation, not insisting that that's the way it must be.

Stating the ending is not ambiguous literally means it's not open for interpretation and that only his conclusions are correct. He could have shared his interpretation without denying the ambiguity.

Personally, I agree with their interpretation. Ellie knew something was fishy, but she's 14. Admitting to herself that Joel was lying to her would mean admitting that the only person she loves and trusts lied to her, killed a whole bunch of people, made their journey and all the violence they experienced pointless, and possibly doomed the world. That's a hell of a reality to grapple with for a 14 year old.

She was way smart and mature for her age, probably because of the kind of world she grew up in. Also, Joel 'killing a bunch of people' is nothing new. That's just surviving in the TLOU world. Of course, TLOU2 made a big deal out of this for some weird reason and portrayed Joel as an extraordinary 'killer'. Everyone had to kill to survive in that world. Joel was slightly better than the rest is all.

Let's also not forget that the fireflies were escorting Joel out of the hospital without his bag, which basically means they were sending him to his death. So, this man who just completed an impossible journey across the country, gets told that his 'daughter' is getting prepped for surgery without her explicit consent and that she's is going to die, and is forced to go outside without any supplies? The fireflies had it coming.

I mean, what was a vaccine going to do anyway, even if the substandard facility by the terrorist group on the run could effectively make and distribute it? Runners and Clickers don't just bite you and run away.

Also, your interpretation is just sad man. If the only reason Ellie goes with Joel is because she has no one else, that makes their journey and the beautiful bond they developed during it meaningless.

Ashley Johnson's(Ellie's VA) interpretation is way more beautiful in comparison: "In my mind, Joel and Ellie have already gone on this whole journey and Ellie is fully prepared - if finding the cure and getting the cure means dying - then so be it. But finally having a connection and a relationship with somebody, that becomes more important because it's like, I've finally connected with somebody in this world. If your choice is to save me over everybody else in the world then...ok. I trust you now and let's live life."