Because once that happens, it not only affects their morale but also concerns life and death.
Today you are able to suppress Great Emperor Ziwei, does that mean you could suppress me tomorrow?
If we are indifferent to the life and death of Great Emperor Ziwei today, then will you also stand by tomorrow when an experienced Dao Lord deals with me?
No one wants to find themselves isolated and without support, especially these newly ascended Dao Lords who originally came together for warmth.
Thus, it's fine for Great Emperor Ziwei to be defeated, but once there is a danger of falling or being suppressed, the rest of the newly ascended Dao Lords will absolutely not stand by and watch.
Even, this situation is something some experienced Dao Lords will not allow to happen.
They can suppress the newly ascended Dao Lords, but they absolutely do not want to see a Dao Lord fall before everyone's eyes.
