Floods of immigrants and refugees...no different.
What are you driving at? The Shiite and Sunni factions are fighting each other to decide whose ideological form of Islam will reign. They are well schooled at deception and that “the enemy of my enemy . . . “
Both are driven by theirs being the the form of Islam they envision to take on “The Great Satan” but they differ greatly from each on detail and will keep their eyes on the prize of a global caliphate while also trying to marginalize any opposition to their ideological road map.