Presidential Lies?

As time passes, President Bush and Prime Minister Blair are feeling increasing pressures regarding Iraq's Weapons of Mass Destruction, weapons which once posed a grave and imminent danger to the freedom of people around the world. Well, where are these weapons? Several sources report the WMD weren't there to start. Instead, the Bush & Blair administrations used the specter of WMDs to drum up public support.

Might & Right
Deceptions
Heat

If weapons of mass destruction weren't the primary motivation behind a war, as we were publicly told, why did we need to invade Iraq?