A bigger court room needed
Yes, there are so many "what about"s about Saddam and what he did which need to be answered, but while you are "entertaining" this kangaroo trial, just remember that in what he did, Saddam wasn't alone. Remember that the western countries including the US were whole-heartedly supporting Saddam when he was committing his crimes. In fact, Saddam was only a tool, an idiot tool and nothing more. Those who fed him are the real master criminals and those are the ones who should also be on trial for the crimes they committed while supporting Saddam and even after the expiration of Saddam. They all should be on trial, but not by a kangaroo Iraqi court, but by an international tribunal at the Hague.
Speaking of trials for crimes against humanity, you might also want to check out the International Commission of Inquiry on Crimes Against Humanity Committed by the Bush Administration. (Thanks to White Old Lady for pointing this out)