Chidi: So, to sum up: Utilitarianism posits that the correct choice is the one that causes the most good or pleasure, and the least pain and suffering.
Eleanor: I like this one. It's simple. Ugh, screw all the other complicated theories, why didn't you start with this one?
Chidi: Ah, but here's the problem. If all that matters is the sum total of "goodness," then you can justify any number of bad actions, like torturing one innocent person to save a hundred, or preemptive war...