The show’s good btw…
FWIW, book three is basically “a feminized society is incapable of making the hard but necessary choices”.
That is one way of reading it. Another is that the vast majority of humans will do the decent thing even if it ends up backfiring on them. Which, if anything, is wildly optimistic. I would also point out that of the two species in conflict, the one that played decent went on to become a galactic civilisation, while the other died out.
Trisolarans did make it to the end. The message sent out to everyone included their language. The humans who became a galactic civilization were from a renegade ship that took the selfish choice in the Prisoners Dilemma.
Wasn’t it only one Trisolarian who survived? Also the humans were from two ships if I remember correctly, and one was a civilian ship.