Grim starts to see that the only way for his job to be truly done is for death to roam on it's own accord
The job can't truly be done unless he's the one doing the judging because he starts to see that the entirety of what he's been doing has been based on someone elses feelings
If the gods and angels perceive someone as good or evil it is only based on their laws and upholding that fear not truly on the actions of the person