Imagine my total lack of surprise at learning that the Bush administration apparently never debated the Iraq war, they just bulled their way into it.
In contrast to an extensive record of planning for actual military operations, there is no record that President George W. Bush ever made a considered decision for war. All of the numerous White House and Pentagon meetings concerned moving the project forward, not whether a march into conflict was a proper course for the United States and its allies. Deliberations were instrumental to furthering the war project, not considerations of the basic course. Moreover, the administration engaged in active measures to avoid scrutiny of its intentions, with the president repeatedly claiming there were no war plans "on his desk." The testimony of senior British military officers to the United Kingdom's Iraq Inquiry (the Chilcot commission), documented in the Archive's analyses, explicitly demonstrates that even America's closest ally was closed out of the CENTCOM planning until “Operation Iraqi Freedom” was far down the road.
Also in contrast to the military planning, there is no record that the Bush administration crafted any plan to attain its goals by means other than covert operations or war.
I have worked in organizations which made “decisions” that way myself.