Since the Mystic Sect's Tiandi is a tyrant, the Great Shang's rebellion against him naturally becomes a righteous cause. Not only are they blameless, but they deserve merit.
Now is not the right time, so Jiang Chen will not act just yet. However, once he reshapes the Prehistoric World, those matters will undoubtedly be revisited and overturned.
The Human Race, born as the protagonists of Heaven and Earth, must embody light and justice. Anything opposing the Human Race is inherently evil and sinful.
Therefore, everything the Human Race has done in the past is correct. If any mistakes were made, they must have been due to slander, and all these will be set right in the future.
No matter who you are, if you oppose the Human Race, or do not align with their values, then you are wrong and evil.
This is what it means to be the protagonists of Heaven and Earth: the moral compass of Heaven and Earth must conform to the Human Race, not the other way around.