The only possible explanation for this monumental stupidity I can think of is an attempt to surround Iran. Invading Iraq is potentially very profitable because

The only possible explanation for this monumental stupidity I can think of is an attempt to surround Iran. Invading Iraq is potentially very profitable because of oil, but invading Afghanistan for $1tr for 20 years "because 911 terrorists" (the official excuse) seemed completely idiotic, if not an attempt to have a foot in the door near Iran.