The political left has come up with a new buzzword: "micro-aggression." Professors at the University of California at Berkeley have been officially warned against saying such things as "America is the land of opportunity." Why? Because this is considered to be an act of "micro-aggression" against minorities and women. Supposedly it shows that you don't take their grievances seriously and are therefore guilty of being aggressive toward them, even if only on a micro scale. You might think that this is just another crazy idea from Berkeley. But the same concept appears in a report from the flagship campus of...