Because the UN has SUCH a good track record...

The UN said yesterday said that Saddam Hussein's trial would never satisfy international standards because of ongoing violence and flaws in Iraq's legal system
John Case, the UN's human rights chief in Iraq, said the murder of two defence lawyers, continued threats against judges, lawyers and witnesses and weaknesses in the Iraqi justice system had caused grave doubts about the trial's legitimacy.
"We're very anxious about the tribunal [trying Saddam]," he told Reuters in an interview. "The legitimacy of the tribunal needs to be examined. It has been seriously challenged in many quarters."

Yeah, thats right guys, you could do a better job, like with those trials against the Serbian leadership from years and years ago? You did a great job resolving those in the internationsl forum didn't you? Oh wait, thats right, those have never finished. Heres an idea, clean up your own mess before you comment on something, it makes you look less like a fool.