Utilitarianism. . . ?

The first three chapters in the section about utilitarianism is generally about describing what Utilitarianism is, its standards, morality, and happiness of others. Utilitarians are concerned with consequences of people's actions. Their standard for judging an action of someone is based on the happiness of ALL people. They are willing to sacrifice their actions for the happiness of others. But why? Happiness for all is impossible and unattainable. Why do they strive to make others happy? We can live without it, it is just a plus to have. "A being of higher faculties requires more to make happy, is capable probably of more acute suffering, and is certainly accessible to it at more points, than one of an inferior type; but in spite of these liabilities, he can never really wish to sink into what he feels to be a lower grade of existence." (242) Mill states that you can never officially be happy, once one thing makes you happy, you then want something else. One becomes greedy and selfish and wants more and more.
Mill goes on to discuss what kind of punishments the people within the philosophical group will have to do, if they do not follow all rules and beliefs. He believes that people will follow and obey if it is a fact rather than a feeling. Though if everyone was educated it would be different because then everyone would understand the good in it.