So since we now know that Sargeras only wants to kill all life in the universe because he wants to prevent the void lords from corrupting the baby titan inside every planet into a dark titan, what does that mean for us and our relationship to the Burning Legion?
If Sargeras can't possibly take down the void lords, then we would never be able to do that either. So if we fight back against the Burning Legion and we succeed and we eventually kill Sargeras and destroy the Burning Legion, all that would happen would be that the void lords and old gods would eventually succeed and a dark titan would be created, and all would be lost.
So shouldn't we instead surrender to the Burning Legion and join them in their noble crusade to save the universe? It is the only chance we have.