A Hunter and His Prey

How can you know?

Felicific calculus. Or does a light slap not seem a bit less of an imposition than an amputation?

Aka: The process of calculating that which is immeasurable.

There are many aggressors and only 1 victim. Together, the overall happiness of the aggressors greatly exceeds the suffering of the victim. Not only is the rape not wrong, put it is the right thing to do according to utilitarianism. The likelihood of this occurring is not the point. The point is that it is absurd to claim that is is always moral to abide by utilitarianism.

There is great civil unrest because a criminal is on the loose. There is no hope of catching the criminal. If you accuse and convict an innocent man, then the riots and lynchings will stop. According to the doctrine of utilitarianism, we should convict a man who we know is innocent.

A utilitarian wants to maximize happiness. Adding in how much happiness each person should receive renders utilitarianism meaningless. If you do not allow the Utility monster to harm the population, then you do not want to maximize happiness. Whether or not a Utility monster exists is irrelevant and it misses the point. If it is right to maximize happiness, then it is right for the utility monster to harm the population.

I am assuming that you realize that nothing is morally or ethically "right or “wrong” outside of the subjective preferences of individuals. If a person attempts to maximize unhappiness, you can only say that you dislike his actions. You cannot say that what he is doing is objectively bad.