The Great Emperor Ziwei and the Jade Emperor are different, the Jade Emperor being old and scheming, seldom acts impulsively.
But the Great Emperor Ziwei has momentum, and with aggressive War Gods like Sun Wukong and Yang Jian by his side, there's always the possibility that they might plan to take action.
With the Divine Court's strength at this point, if they were to clash with the Heavenly Court, they wouldn't stand a chance.
Moreover, no one can guarantee that The Three Pure Ones would not intervene to help Ziwei Heavenly Court.
If The Three Pure Ones intervened, they would have even less of a chance.
Now, their only option was to seek strong reinforcements, format a confrontation, and keep the Heavenly Court from acting rashly, then use tactics to reduce the number of living beings in the world.
As for taking direct action, they wouldn't do such a thing.
Because that would anger The Three Pure Ones, prompting them to take action themselves.
