It's our moral responsibility to try and identify how others feel -- that would include identifying how it must feel to be a victim of Saddam.
Saddam's crimes were criminal to all. I pity those who have no more empathy than bystander-ness when it comes to crime and the victims of crime.
It's a solemn thing to have to kill a criminal. It is also a time of celebration of justice served...for everybody.
Celebration of Justice Served, yes. Celebration for the need to met out such justice in the first place, no. We can have sympathy for victims of violent crimes, but not empathy unless we too have been a victim (such as in losing a loved one to a murderous tyrant or thug). Unless one has experienced that pain, there is no way of really identifying with those who have. Imagining the pain is not, and can never be the same as experiencing that pain.