I also have wondered why so few, or even none, really paid attention to what the Elders did. I mean, they basically blew up the head of the space ONU (CONCORD), allowed as you say the Caldari to retake Caldari Prime, caused millions of deads, genocided Amarrian planets with Insorum, and got out with nobody even trying to go after them to make them pay. I mean, in comparison to what Sansha did the first time, it is without proportions. Everyone do as if nothing happened, lalalalala.
Would I be CONCORD, I would do everything I could to hunt them down and bring them back to justice. And I would start by confirming permanently the Thukkers as outlaws, and chasing them to get answers and clues.
Would I be the Amarr, I would fully support the initiative.
Would I be the Minmatar, I would ask for answers (except for the puppet shakorite movement).
Would I be Gallente, I would be pretty pissed too.
Maybe the Caldari are the only ones not totally pissed by what happened, but still. Opinions might vary between individuals.