Jonah has a question: Why?

Via NRO:

Why is it obvious that intervening in a civil war is not only wrong, but so self-evidently wrong that merely calling the Iraqi conflict a civil war closes off discussion?

Surely it can’t be a moral argument. Every liberal foreign policy do-gooder in Christendom wants America to interject itself in the Sudanese civil war unfolding so horrifically in Darfur. The high-water mark in post-Vietnam liberal foreign policy was Bill Clinton’s intervention in the Yugoslavian civil war.

Ok Mr/Ms. Anonymous since you've got all the answers - Why?