Let's say we have a man, akin to hitler, or stalin, or any other totalitarian. Let's say this man is solely responsible for killing (how is irrelevant) 1,000 men, women, and children. To clarify, this man is labelled "evil" after killing said people. His stature and being is neutral beforehand and irrelevant.
He is now deemed an extreme threat to society, and justice must be put upon him.
Before he is caught, he sporadically solely saves the lives of another 1,000 men, women, and children. The people he has killed and saved are just "people". They are not any specific race or religion.
So now society is at a loss; do they try him and condemn him to justice- or do they let him go? It comes to a point where human emotion is the tiebreaker; but if we choose to damn him to death, does that make us value the death of those 1,000 people over the life of the other 1,000?
Does that make us carnal animals only seeking vengeance, or should we stick to the logic of balance (killing 1,000, saving 1,000)?