It's more that ethical theory has a tenuous grasp on contextual morality, and therefore even systemically ethical actions can contextually be deeply immoral, which is why focusing on writing about and deriving endless hypotheticals and thought experiments to 'determine the truth value between ethical systems' (as the deotologoists and utilitarians of the era were always doing) is an intellectual dead-end, like arguing how many angels can fit on the head of a pin.