Hello. I wanted to ask about revenge. (1) Is there anything morally wrong with taking revenge? (2) If the urge to take revenge is a genetic instinct (and surely, it's quite plausible that it might be), why should it have less moral authority than any other feeling about right and wrong? The background to this question is that, while there's no explicit eye-for-an-eye in the laws of most contemporary societies, usually judges take community expectations and appropriate punishment into account when sentencing, and not just factors like legal requirements, precedence, rehabilitation and deterrence -- so revenge is arguably still very much a part of modern law.