Unfortunately for Rumsfeld, he talked back when it wasn't clear that his Iraq strategies would result in such disasters. Read Plan of Attack. It clearly reports times when the Secretary of Defense sent plans for the invasion back to the planners. He insisted, among other things, that the numbers of troops called for be reduced.
Get that book, if your library has it. Write a letter to any local paper which covers this issue pointing out his contradictions.
Of course, the longer Rummy stays on the better for the Democrats politically. But the worst for our troops and the people in Iraq -- and maybe in Iran.