The utilitarian argument for giving is straightforward: Going skiing instead of camping (or whatever) may increase your happiness, but it's nothing c… - Joshua Greene

We face two fundamentally different kinds of moral problems: Me versus Us (Tragedy of the Commons) and Us versus Them (Tragedy of Commonsense Morality). We also have two fundamentally different kinds of moral thinking: fast (using emotional automatic settings) and slow (using manual-mode reasoning). And, once again, the key is to match the right kind of thinking to the right kind of problem: When it's Me versus Us, think fast. When it's Us versus Them, think slow.

It's plausible that the goodness and badness of everything ultimately cashes out in terms of the quality of people's experience. On this view, there are many worthy values: family, education, freedom, bravery, and all the rest of the values listed on the chalkboard. But, says utilitarianism, these things are valuable because, and only because, of their effects on our experience. Subtract from these things their positive effects on experience and their value is lost. In short, if it doesn't affect someone's experience, then it doesn't really matter.

We can summarize utilitarianism thus: Happiness is what matters, and everyone's happiness counts the same. This doesn't mean that everyone gets to be equally happy, but it does mean that no one's happiness is inherently more valuable than anyone else's.