If they couldn't win, then the Outsiders would invade, and the mainland would fall into calamity. The common people will be met with poison, and chaos will reign all over the lands. Wouldn't the three Holy Lands be the greatest sinners of the world? Furthermore, this matter regarding Heavenly Punishment was also initiated by them!
Nothing anyone said would make it the fault of Heavenly Punishment! Even if the Outsiders really succeeded in their invasion, the living environment of the Heavenly Punishment Mystic Beasts would not change at all. No outside forces had ever managed to invade Heavenly Punishment Forest. That was the case in the past, the present, and will also be the same in the future as well!