>>15161802Ethics are the logic of morality while broad morality is collectively decided guideline of actions influenced by culture.
Ethics seeks to distance itself from the subjectivity brought by culture, it seeks universalism.
Willingly enganging workers in a situation guarented to bring them harm while not informing them beforehand is unethical. It is a breach of trust. You brought harm to a fellow that sought you none.
While it still remains connected to subjective terms like "fellowship" you could embrace a universal "fellowship" such as humanism and reject any other tribalistic distinctions.
Ethics may depend on subjective parameters for it to be applied but remains logic beyond them.
Thus slavery is only unethical if you consider "fellowship" as encompassing all humans.
Ethics becomes mathematical when all the subjectivity that remains are the parameters of "harm" and "fellowship".