Frontline leans left, no doubt. But the program was balanced. We weren't prepared to occupy Iraq after the invasion but President Bush fired Rumsfeld in '06 and then tapped a Princeton Intellectual in General Petreaus to oversee the troop surge. We won the war. But President Obama washed his hands on Iraq. He wouldn't even stay in touch with Iraqi Prime Minister Maliki. Guess what Maliki did? He went after the Sunni, stopped paying Sons of Iraq to oversee Sunni territory. So Sunni had no options left but to ally themselves with the Islamic State because they want to see Maliki's head on a pike in Baghdad.
Frontline did a good job showing how Obama dropped the ball on Iraq.