-- CIA has stated that UN sanctions against Iraq since the first Gulf War have suppressed the development of WMD, that Iraq would therefore have a full-blown WMD program running immediately after the removal of those sanctions. They have also stated that regime change is the only way seen to allow removal of UN sanctions and the no-fly zones, while preventing the startup of Iraq's WMD programs.

-- Iraq was financing suicide bombings in Israel

-- Iraq has the 2nd largest proven oil reserves, at 10.7% of the world's total. With USA in control this oil can be diverted solely to USA, rather than other buyers, in the event of a Hubbert Peak scenario circa 2015.

-- Saddam Hussein was annoying.

-- USA can test the world, find out who their allies really are.

-- some or all of the above.

Can anyone think of other reasons to invade Iraq?