Steven Den Beste lays out all the reasons why we went to war in Iraq. WMD's, although important, was not the issue, they were the legal pretext for the UN. (Tax evasion was the legal pretext for jailing Al Capone. The issue was that he was a murderous gangster.) Oil, although important, was not the issue either. Addressing the root causes of radical Islamic terrorism was the issue. Den Beste is always worth while if you like in depth analysis.
Go read.