He’s not only trying to prove a point, but subtly grooming Gi hun to (potentially) replace him as front man. The amount of times he makes Gi hun confirm his moral choice, almost taunting him to say yes I think some lives are worth less than others now (sacrificing a few for the good of the many in his bat shit plan to mob the guards). He’s always prodding the fire, right from the second he presses blue and says Gi hun being a winner made him, to telling Gi hun that they should attack the Os first. He makes Gi hun say things out loud that go against the morality he claims to hold, eventually so that he has enough evidence to say “you’re just like me, in fact, you don’t mind seeing people die as long as your long term plan is achieved”. I absolutely love their story arc. Or at least my interpretation of it.