I suppose then you would have to include the likes of:
FDR as a war criminal, since he helped the British long before Germany went to war despite claiming neutrality and he mislead the American Government and military and people, though the reasons may not have been publicized til later, that the Germans had or almost had an Abomb, when they were far from it since they lacked enough of the key ingredient of Heavy water.
Or the accusations that the British let the Luisitainia be sunk by ignoring dangerous waters, signs of nearby subs, and by Carrying Arms for War (thus making the ship a legitimate target), just to get the U.S. into war.
Or JFK for getting America involved in Vietnam in the first place.
Or Mckinley and Teddy Roosevelt for the Phillipino War, many died in that one too.
Or the British leaders and Queen Victoria for the hundreds and perhaps millions of dead from the Opium Wars of the 19th Century.
Or Putin and Yeltsin for the Cheychnyan War.
Or the British and the French negotiators for inaccurately dividing up the Middle East after WWI against T.E. Lawrence's advice and one of the main causes of so much trouble there today.
Or.... (I could go on with many examples as bad, but mostly worse than anything Bush ever did and many more civilians died in many of these mistakes of government, partly because they had yet to develop smart and accurate weaponry.)
Leaders dont always know all information with a 100% accuaracy, besides at least he had other reasons to go. And guess what many if not all politicians and leaders lie.