"If it would save even one life, it would be worth it." You often hear people say that. Are they wrong? Is anything worth saving one life? Three? Dozens? Thousands?
While it's unclear at the moment who or what is responsible for the carnage at the Boston Marathon, suppose some sort of ethnic or national profiling could have prevented 3 deaths and 150+ injuries (some life threatening). Would it have been worth it?
And if not, why not?