Ever since the establishment of the Underworld, none of the successive Yamas of the ten halls have been free from bias, so very few have met with a good end.
This is precisely the result of karma and reincarnation, where retribution is unavoidable.
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"The Underworld governs the reincarnation of living beings, which is of utmost importance. If this chaos continues, it will be of no benefit to Heaven, Earth, or humanity."
"If I ever come into power, I will certainly reestablish order in the Underworld, restore its authority, and implement the principles of utmost fairness!"
As one who aspired to become the Emperor of Fengdu, Jiang Chen naturally disapproved of the Underworld's conduct and secretly resolved to reorganize the Underworld when he had the chance. At the very least, he believed, fairness must be ensured.