Let's call it what it is Sunni are trying to take out Shia. Bring in Wahhabism as the law and cultural religious belief and right. Like it's fucking normal or something. For right now they are fighting amongst each other.
But Shia run territory must be wiped out, it is the only thing standing in the way. That and Russia backs Shia land and people. Why Russian Propaganda is always on the menu.
It is about bloodlines and territory. Beliefs and ideals.