Actions have consequences. Saddam will face his.
If Saddam had announced his intention to subjugate the world to the master race and was in the process of invading nearly every country in Europe, your comparison might be a little more apt. As it is, the mullahs and Islamic radicals now call the shots in Iraq and indeed much of the Middle East. It is they, not Saddam who threaten America and Europe.
There's a stark irony in his execution in the month in which America suffers its heaviest casualties. It highlights how irrelevant he is and always was to the whole Islamic terror network.