Perhaps we’re not supposed to look at a rainbow because that’s not the way the world is right now. Just keep on going, and after all is said and done, the proverbial rainbow will appear.
Not only was Noach the one who saved the world, but Avraham Avinu also had that same capability to save Sedom. That is the power of a Tzadik.. to save a one keep alive the world.
The Torah goes out its way specifically to tell us Noach was the one who kept the world going. If not for him, it would’ve gone back to complete oblivion.
The Torah ends off with the breaking of the luchos to teach us that a person can have their own “broken luchos”. But afterwards don’t think it’s over. Start again from Bereshis.