Bringing up Adolf Hitler is a completely valid argument. Using your logic, you wouldn't support going to war against a man that killed millions of Jews. That is your logic, I'm not changing anything here.
Iraqi culture and Middle Eastern society in general believe in execution as a means for carrying out justice. You don't have to agree with it, but it's a cultural form of sentencing in their society. A lot of Iraqis who lost loved ones at the hands of Saddam Hussein believe that watching him die will bring them with some sense of closure. To them, justice will be carried out. I was brought up in a Western society, but most Americans still believe that the death penalty is fair. If someone kills a pregnant women, or rapes and kills a small child... tell me why we as tax payers should pay for their jail cell for 50 years? It's very costly to keep someone in prison for life. If they killed someone in cold blood... why should they be allowed to live at the tax payers expense? In terms of Saddam Hussein, you should respect what the Iraqis want and what their culture advocates. They want him to die and they should be able to carry out that sentence.