650,000 Iraqi's blood on dubya's hands?

Regarding that Lancet study which says there could be as many as 650,000 Iraqis dead thanks to dubya's(Worst President EVER!) disatrous useless invasion.
Here's the study(pdf):
"In Iraq, as with other conflicts, civilians bear the consequences of warfare. In the Vietnam war, 3 million civilians died; in the Democratic Republic of the Congo, conflict has been responsible for 3.8 million deaths; and an estimated 200,000 of a total population of 800,000 died in conflict in East Timor. Recent estimates are that 200,000 people have died in Darfur over the past 31 months. We estimate that almost 655,000 people -— 2.5% of the population in the study area —- have died in Iraq."
For more here's Juan Cole: