It's not really about the 'Boogeyman Maliki'

"... The most significant factor behind Iraq’s problems has been the inability of Iraq’s Sunni Arabs and its Sunni neighbors to come to terms with a government in which the Shias, by virtue of their considerable majority in Iraq’s population, hold the leading role. This inability was displayed early on, when Iraq’s Sunnis refused to take part in Iraq’s first parliamentary elections, and resorted to insurgency almost immediately after the US invasion and fall of Saddam Hussein. All along, the goal of Iraqi Sunnis has been to prove that the Shias are not capable of governing Iraq. Indeed, Iraq’s Sunni deputy prime minister, Osama al Najafi, recently verbalized this view. The Sunnis see political leadership and governance to be their birthright and resent the Shia interlopers..."