It's in the nature of social progress that conditions which today strike us as obviously morally outrageous--that women were not allowed to vote or blacks to be served at restaurants--were once considered the natural order of things. Three decades ago, almost no one thought it unjust that there were no parking spaces reserved for the disabled, or that airline passengers were forced to breathe in other people's cigarette smoke. We are now in the middle of a similar mass awakening to the unfairness of banning gays from marrying and serving openly in the military.
What is the next great injustice that we do not yet recognize as such but soon will? How about the way the higher education system screws millions of lower-income students?