That's because the "Iraqi" and "Syrian" governments never existed, they have been since their births nothing but extensions of tribal and religious identity. Sunni minority brutally repressing shia majority in Iraq, along with a smattering of other minorities, shia minority brutally repressing sunni majority in Syria, along with a smattering of other minorities. I say shit about sunni militias in Syria and Iraq, sure, but Baghdad for example went through massive ethnic cleansing of sunni by shia militias. There really are no "good guys" here. There seldom are anywhere. Anyone who was even slightly familiar with the history and culture of both of these countries knew this, the fiction that a government fairly ruling over these disparate groups that loathe each other could be accomplished in Iraq and can be accomplished in Syria is toddler-level Disney princess unicorn wishfull thinking.