A
theory based on
moral relativism, stating that
because it is impossible for one person to judge the
morality of others (and their actions) that use a different moral
system (the basic
tenet of moral relativism), all people are therefore morally equal.
In my opinion, moral equivalency falls victim to the the same mis-assumption that characterizes secular Western humanism (and its offshoots), the assumption that human beings are inherently good. Intelligence does not imply morality; any sufficiently intelligent person or group can systematize evil and promulgate that system effectively given resources, at least until someone else intervenes. We've seen a few regimes like this in the 20th century.
Conservative commentator Cal Thomas wrote a column on 13 September 2001 (http://www.townhall.com/columnists/calthomas/ct20010913.shtml) entitled "The Death of Moral Equivalency", which partially inspired this node. While I don't really agree with all he says (or even his definition of moral equivalency), it's worth thinking about.