Why all the different reactions to al-Zarqawi's demise?

There was general agreement amongst sane people that al-Zarqawi was evil incarnate and a key leader of the terrorists in Iraq which have been killing our soldiers, Iraq police, and Iraqi civilians in an attempt to prevent a stable democracy from forming. Why then are there so many divergent positions and statements in response to the trash being taken out?

You have some who see this as clearly good news and go on to explain how it will help.
In A Good Day's Work Why Zarqawi's death matters, Christopher Hitchens sums up the position of those who see this a good news.
Daniel Henninger's Wall Street Journal article A Moral Victory The meaning of Zarqawi's death dispels the notion that Abu Musab al-Zarqawi represented the word of God.
Then you have a number of articles by organizations either emotionally or politically committed to our failure in Iraq. These articles are all notable for one word midway through the headline or the first sentence - BUT.
Reuters: Zarqawi found, but bin Laden still eludes US.
Tom Lassetter of Knight Ridder Newspapers: The killing of terrorist Abu Musab al-Zarqawi was a stunning victory for U.S. forces, but Iraq remains a nation beset by deeply rooted problems that threaten to push it deeper into chaos.
Zarqawi Killing Great, but Pull Troops, Say Kerry, Murtha.
Actually, Kerry and Murtha seem relatively sane compared to some of their congressional colleagues.

Some Democrats, breaking ranks from their leadership, today said the death of terrorist leader Abu Musab Zarqawi in Iraq was a stunt to divert attention from an unpopular and hopeless war.
"This is just to cover Bush's [rear] so he doesn't have to answer" for Iraqi civilians being killed by the U.S. military and his own sagging poll numbers, said Rep. Pete Stark, California Democrat. "Iraq is still a mess -- get out."
Rep. Dennis J. Kucinich, Ohio Democrat, said Zarqawi was a small part of "a growing anti-American insurgency" and that it's time to get out.

Hey, Dennis if the insurgency is growing, how do you explain the fact that more and more Iraqi's are assisting the coalition forces in rooting out the problem including providing the tip which led to Zarqawi.

You would at least think the response of relative of al-Zarqawi's victims would be uniformly
pleased to see him dealt with, but you'd be wrong.
The son of Paul Johnson Jr. who was beheaded by al-Qaida terrorists seems to have a reasonable response:

"The anniversary of my dad's death is right around the corner," said Johnson, a Port St. John resident. "Hearing this pretty much shocked me, but it was a nice shock. I'm glad he's dead. I hope he rots in hell, to tell the truth."

On the other end of the insanity scale you find the father of Nicholas Berg.

Michael Berg, whose son Nick was beheaded in Iraq in 2004, said on Thursday he felt no sense of relief at the killing of the al Qaeda leader in Iraq and blamed President Bush for his son's death. Asked what would give him satisfaction, Berg, an anti-war activist and candidate for U.S. Congress, said, "The end of the war and getting rid of George Bush."