If we think of the rules as exhaustive covering all possible scenarios and participants, perhaps that would make it simpler?
ex. Bob murders Frank under circumstance X: Evil
Bob murders Frank under circumstance Y: Not evil
Bob murders Frank under ...
Is that subjective or objective? It depends on the details, but each situation only has one correct answer.
ex. Bob murders Frank under circumstance X: Evil
Bob murders Frank under circumstance Y: Not evil
Bob murders Frank under ...
Is that subjective or objective? It depends on the details, but each situation only has one correct answer.