On Wednesday, according to news reports, James W. Von Brunn, a longtime belligerent racist and anti-Semite, walked into the U.S. Holocaust Memorial Museum and opened fire, murdering a security guard before he himself was shot and neutralized. Good people everywhere recognize the vicious criminality of his attack, and the particular insidiousness of his motivation to lash out where he did. In reflecting on this tragedy, it is an appropriate time to contemplate the sanctity of innocent life, the...