I am Sunni Muslim, my father "worked" in Iraq during the Gulf War times in 1991 and I have spent almost my entire life in the Middle East. I believe I would be in a good position to comment on what the uninitiated world should feel about his and his sons' death. The only way I wished he were not hanged, is when he would instead be kept alive and tortured JUST LIKE THE WAY he tortured, raped and killed tens of thousands during his regime.
The worst of the lot was Saddam's eldest son, Uday, go browse around and you will shiver just by reading his tales of terror.
I also count Bush, Blair, etc. in the same light. But the point I'm trying to make is - sure death penalty might not be the right punishment for the modern world, but Saddam and sons so deserved this. This might set a dangerous precedent cuz US seems to be taking care of everything, justly or unjustly, but at least you people shouldn't "feel" for Saddam and his sons. The tyrants! Words fail to describe their tyranny.