You might be interested in some previous threads on Saddam Hussein being left in power after the first gulf war:

• Why was Saddam Hussein left in charge of Iraq after the Persian Gulf War? - 14 comments, over 1 year old.
• This thread discusses the issue as a matter of obeying the terms of the UN resolutions upon which the coalition was based.
• Was the United States backing Saddam Hussein before (and after) the Gulf War? And if so, why? - 4 comments, over 1 year old.
• This thread takes a US interests perspective in dealing with why Saddam was left alone.
• Why was Saddam Hussein allowed to stay in power after the first Iraq War? - 8 comments, over 4 months old.
• One of the commenters link to an involved historical figure's own analysis justifying this decision.