It seems like there's some kind of revelation MC had by the fact some information has been shared by Sabas over the Life and Death rule in this world.
If she needs more card, then she needs to kill.
But at the same time, morality, she thinks she will not commit a real genocide because she can revive them and guide them to the right path accordingly to her judgement.
If her judgment were like an Earth/Japan way of managing the citizens, then it is right i guess...