When you spin it the other way it goes something like this.

The more crucial an issue, the more important it is to follow all the steps of due process. For example, if you are talking about a charge of a capital offense, it is even more important that all the Ts be crossed than if you are talking about a traffic ticket.

Among nations, the closest analog to the death penalty is one country conquering another. That means that if you purport to be a moral nation, before launching an invasion, you need to follow due process.

Since our society has not yet progressed to the stage where we have a set of international laws and penalties to define appropriate behavior for states. And since we have no international judicial and executive authorities to approve of the penalty and to execute the penalty. Then consensus among states is the closest we can come.

I appreciate your concerns about mob rule. But I've gotta point out that you seem pretty unconcerned about its ramifications when the polls are going your way.

So your alternative to consensus is one or some states who know what the right thing to do is. And you imply that America is the one that will have this divine knowledge, and should be the one in the world to make these decisions. In case this isn't as apparantly absurd to you as it is to me, let me point out that morality is in practice a sliding scale: people (and nations) tend to find moral, those things that are otherwise in their interests anyway.