One who believes that the morally right action is the one with the best consequences, so far as the distribution of happiness is concerned; a creature generally believed to be endowed with the propensity to ignore their own drowning children in order to push buttons which will cause mild sexual gratification in a warehouse full of rabbits.
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Henry Fitzgerald, A Non-Philosopher's Guide to Philosophical Terms
The chief flaw in Utilitarianism as a system of ethics is that happiness or utility is a subjective individual property, and human nature being what it is, a decision that makes one person or group of people happy will always make another group equally unhappy. Objectivism eliminates this flaw by arguing that rational thought can determine which group should be made happy, which, obviously, introduces quite a few new flaws. So it goes.