Robert Kellert, has written an article in Opinioneditorials and have discussed the reasons of US invasion to Iraq.
The writer of this article has discussed the realities by which the war has been justified. He points to the atrocities by Saddam. The reasons have been argued in 250 paragraphs from which one talks about Mojahedin-e Khalq:
Iraq shelters terrorist groups including the Mujahedin-e-Khalq Organization (MKO), which has used terrorist violence against Iran and in the 1970s was responsible for killing several U.S. military personnel and U.S. civilians.