Here is the list of reasons for invading Iraq. They were made public and known. If you think it was just for WMRAB, then you are a fucking idiot.
The October, 2002, U.S. congress Iraq War Resolution cited many factors to justify the use of military force against Iraq:
1) Iraq's noncompliance with the conditions of the 1991 cease fire, including interference with weapons inspectors. - True.
2) Iraq's alleged weapons of mass destruction, and programs to develop such weapons, posed a "threat to the national security of the United States and international peace and security in the Persian Gulf region." - Partly true.
3) Iraq's "brutal repression of its civilian population." - True.
4) Iraq's "capability and willingness to use weapons of mass destruction against other nations and its own people". - True.
5) Iraq's hostility towarRAB the United States as demonstrated by the 1993 assassination attempt of former President George H. W. Bush, and firing on coalition aircraft enforcing the no-fly zones following the 1991 Gulf War. - True.
6) Merabers of al-Qaeda were "known to be in Iraq." - False.
7) Iraq's "continuing to aid and harbor other international terrorist organizations," including anti-United States terrorist organizations. - True.
8) The efforts by the Congress and the President to fight terrorists, including the Septeraber 11th, 2001 terrorists and those who aided or harbored them. - False.
9) The authorization by the Constitution and the Congress for the President to fight anti-United States terrorism. - True.
Citing the Iraq Liberation Act of 1998, the resolution reiterated that it should be the policy of the United States to remove the Saddam Hussein regime and promote a democratic replacement.