the Nuremberg trials were in a way the source of modern war crime legislation, besides shortcomings. There was an international panel of judges and "all" the issues were dealt with.
Besides :
"The legal basis for the jurisdiction of the court was that by the Instrument of Surrender of Germany, political authority for Germany had been transferred to the Allied Control Council which having sovereign power over Germany could choose to punish violations of international law and the laws of war."
This is not the case in Iraq
1) the war against Saddam was illegal (who then is legally entitled to judge him ?)
2) Saddam is tried by Iraquis only and for a "minor" crime but risking death penalty at the same time. He is not tried for gassing Kurds or Iranians. It's obvious that reparation (even only if moral) to the victims other than in the "minor" case won't be possible if he is hung. Imagine trying somebody in the US for a case of pedophilia,
but not testing a case of proven murder of another child.
Gary Bass in the NYT comments on the possibility that Saddam could be sentenced to death and executed for a 1982 massacre of about 100 villagers, without ever being brought to trial on the main array of charges against him, including killing political rivals, crushing the Shiite uprising in southern Iraq in 1991, invading Kuwait in 1990 and waging the genocidal Anfal campaign against the Kurds in 1988, including gassing Kurdish villagers at Halabja. As Bass says,
A thorough series of war crimes trials would not only give the victims more satisfaction but also yield a documentary and testimonial record of the regime’s crimes.
But looking at this list raises a more basic question. Why hasn’t Saddam been charged with any crime more recent than 1991?<1>. In the leadup to the war, and in its aftermath, it was routinely claimed that Saddam’s regime, at the time it was overthrown was among the most brutal dictatorships in the world. Even among opponents of the war, hardly anyone doubted or doubts now that the regime often practised murder and torture. Why then aren’t there any charges covering this period? Presumably both documents and witnesses are more readily available than for a crime committed more than twenty years ago.
The purpose of this is to get rid of him as soon as possible and avoid "embrassing" questions. Since the trial doesn't meet international requirements for dealing with war crimes, it's a parody of justice, a soft lynching.
http://crookedtimber.org/2005/09/29/saddam-trial/