Ilya Somin debates the morality of voting:
There is only an infinitesmal chance that any one vote will be decisive. So individual voters have strong incentives to remain ignorant. But not every form of rational behavior is morally defensible. Sometimes, rational individual behavior leads to terrible collective outcomes. Consider the case of air pollution, where individuals might rationally choose not to limit their emission of dangerous pollutants because any one person’s behavior has only a tiny effect on overall air quality in the area. Widespread voter ignorance is a kind of pollution of the political system.