On Monday, two young men planted bombs in Boston and last night killed a policeman before one of them was, himself, killed. The other remains on the run.Politicians have thrown around the word “cowards” to describe these guys.Do they not know what the word means?The basic definition is “a person who lacks the courage to do or endure dangerous or unpleasant things.”These young men have endured danger and caused unpleasantness.Call the monsters. Call them evil. But cowards? I don’t think it fits.