Self righteousness can be a disease afflicting the true believers in any cause. But the animal rights movement seems to be home to more than its share of people who believe their cause is so right that they are excused from normal human constraints. They have no more consideration of others than the beasts they whose interests they place above humanity's. More than two decades ago, a childhood friend who grew up to become a world-renowned medical researcher, whose work has improved the lives of countless people suffering a horrible affliction (and who has had the extraordinary honor among medical...