Gen. Colin Powell, then chairman of the Joint Chiefs of Staff, said these questions all must be answered with a loud YES before the United States takes military action.
1. Is a vital national security interest threatened? 2. Do we have a clear, attainable objective? 3. Have the risks and costs been fully and frankly analyzed? 4. Have all non-violent policy means been exhausted? 5. Is there a plausible exit strategy to avoid endless entanglement? 6. Have all the consequences of our action been fully considered? 7. Is the action supported by the American people? 8. Do we have broad international support?
Rumsfeld didn't want these questions even considered before we attacked Afghanistan and Iraq. As a man with a at least some intelligence, he knew where the questions posed in the Powell Doctrine would have had to have been answered with an emphatic "no"!
Apparently, Rumsfeld experienced a catastrophic episode of "selective memory lapse" in terms of which country successfully armed and trained the Taliban against the Soviet Union's occupation of Afghanistan. That has come back back to haunt the white house and the pentagon in this current military misadventure.
It was sheer and utter hubris, coupled with a very special kind of lunacy, thinking that the US could manage to hold by force a country which has only been successfully conquered (for a brief period of time) by Alexander the Great.