Even in this age of runaway emotions, there are still some people who want to know the facts. Nowhere are facts more important, or more lacking, than in what has been aptly called "The War on Cops," the title of a devastating new book by Heather Mac Donald. Few, if any, of the most fashionable notions about the police, minorities and the criminal justice system can withstand an examination of hard facts. Yet those fashionable notions continue to dominate discussions in the media, in politics and in academia. But Ms. Mac Donald's book of documented facts demolishes many fashionable notions....