G-man- Moral relativism is the reason Tony Blair specifically and the White House now uses for the invasion of Iraq. "Saddam is an evil genocidal murderer, he must be punished." Sovereignty is no bar to justice (in the absence of WMDs). Genocide itself was one of the reasons the UN was formed - to prevent another Holocaust (Clinton acknowledged everyone, including the US, failed in Rwanda). So if the leaderships of governments as at 1945 thinks that genocide is intolerable, I think you have a de minimus consensus on the moral relativism of genocide (setting aside common domestic laws relating to murder, torture, rape, etc).
Unless you're Dr Manhattan and so totally removed from emotion as to be schizoid, if you had super-powers which gave you a nigh invulernable advantage over ordinary murderers, rapists, and perpetuators of genocide, its hard to see how you could stand back and do nothing, sovereignty or not. Even Spider-man, as I alluded before, would have to be tempted to learn sharp-shooting assassinate Kim Il Jong in the hope of improving the lot of millions of North Koreans, simply because he has a better chance of success than most assasins. (The Punisher and Wolverine, fortified by no compuction about killing, would have deposed the North Korean government by now.)
So what the Authority did makes sense to me - ending the war in Chechnya, intervening in Timor L'Este, and forcing the PLA out of Tibet - and what the JLA do (nothing) is morally bankrupt at best.
