Zhao Hai naturally did this for his own benefit. Only by letting the people from those worlds fight with the people from the war god Realm to the point where both sides suffer would Zhao Hai be able to help.
Moreover, Zhao Hai had no reason to be a living Lei Feng. Although he had a grudge against the world of war gods, those people also had a grudge against the world of war gods. There was no reason for him to be the only one fighting the world of war gods while those people were hiding and watching the show. They might even stab Zhao Hai in the back. Zhao Hai would not do such a thing. The people from those worlds were not Zhao Hai's sons, so Zhao Hai did not need to be polite to them.
It was precisely because of this thought that Zhao Hai used words to lure the representatives of the other planes step by step. He made them think that as long as they didn't go all out against the war god Realm, their planes would be in danger, and they would be in danger.
