Here is part of their justification:
The actions of these two men reflect on the body of Christ wherever it is found. And their actions have sent a message that war, war without provocation is acceptable to the churches of Christ throughout the world. As such, these two men, who have used biblical imagery throughout their threats of war, and continue to do so, have placed Christians everywhere in a precarious position. – a position in which we all must take a stand, to the right or to the left, with the sheep or with the goats.
I therefore humbly and prayerfully plead with you in the name of our blessed Savior Jesus Christ, who taught us not to return evil for evil, to turn the other cheek and that we are blessed when we are peacemakers to completely distance yourselves from this war and excommunicate George W. Bush and Richard Cheney from your fellowships. They have left the Gospel at this hour.