Obama has great diplomacy skills with world leaders, he seeks solutions and extends the hand of friendship to dissolve the hatred of America that Bush caused.
Bush could yet be convicted of war crimes, because there were no nuclear weapons in Iraq - therefore Iraq families could technically sue trillions for killed members of their families and damaged property. He should have sent more troops into Afganistan and left Iraq alone - the country may take 60 years to settle down and stop civil war, just like Ireland did.
Might is never right, your enemies need their grievances listened to, so that the root causes can be removed. Empathy, by walking in your enemy's shoes for a few months can make a big difference to understanding how to bring peace to the world.
Heaven on Earth won't happen until their is empathy and Will to sort out the wrongs and to energise forgiveness for all parties.