@Degernase no no no, I also don't want brutal MC, they get old fast. I would like to hear that MC despises that type of behavior from people (like a sentence "it is them that should be slaves" or "what kind of corrupted world is it?" or something that would show his dislike) but now we don't have anything like that. MC is fine with with physical abuse towards slaves, he is fine with slavery but he isn't fine with murder?
His character doesn't make sense. Contradictory in every sense.
But it is authors fault for trying to make a silly manga with serious concepts like slavery.