As we know, some militarized groups in Iraq has tried to oust conventional government many times.
They think that it's the best way to make this world better, because of lack of democracy concept.
It will be caused by lack of experience to study importance of democracy.
( Foreign soldiers in ISIS ia an exceptional case, they decided to cooperate with ISIS, not because of agreeing their mindset, but because of fee they'll be able to get)
So, Iraqi government must focus on education, especially education about democracy.