My personal take about the last of us ending

Joel
wasn't selfish and he did not doom the world by what he did ... What
Joel done requires some maturity to be understood ... Joel realized that
the world is becoming a terrible place and not because the pandemic it
was because the evil of humans ...
90% of the game your serious encounters/struggles are with fellow
humans .. the pandemic has uncovered the worst of the human race but its
no longer the source of evil .. The pandemic just waken up the evil
that was always there it did not invent it ... Therefore the cure that
would cost sacrificing Ellie will not going to make any difference ...
He lost a daughter once and he wasn't ready to sacrifice by another one
...Beside Joel's love to Ellie he realized that curing people will not
going to diminish the evil that spreaded every where so he just went
with saving the only thing that meant anything for him ... And yes
Surely Ellie will forgive him she just need to grow up to understand the
complexity of the suffering that Joel met through his life and the
nobility of his sacrifice ...