Quote Originally Posted by Ryllharu View Post
Gen and Senku discussed how the lie will backfire on them either way, episodes ago.

The point is to end Tsukasa's influence and return to an innovation and science-based society that intends to save every petrified human on earth. "Might Makes Right" is currently winning, and Tsukasa intends to kill off all the older people for good so that his "pure" society is all that remains.

This has been explained.
And what did they decide on that will prevent any severe backlash?