He could not be sure if the impact on the future would be good or bad.
Although Flesh Sacrifice was a cultivation technique with the hidden danger of humanity's extinction concealed within, before the owner of the fog activated the switch, this cultivation technique was evaluated as the undisputed number one cultivation technique in human history.
It could be seen how powerful it was for cultivators.
It could be said to have greatly contributed to the development of the overall strength of humankind.
Therefore, the disappearance of Flesh Sacrifice would definitely change history and slow down the development of human cultivation. Perhaps it would not last 1,500 years.
At that time, even the Star City Shelter might not exist.
This was also the main reason why he wanted to resolve the hidden dangers of Flesh Sacrifice.