Karzai just voiced the undisputable fact: 99.9% of his country are Muslims and will support another Muslim state if it is attacked by The Great Satan.
He could say that "we will support the USA" but then the royal "we" would be limited to him and a dozen of his advisors. It's not something he can choose and make it happen.
Well, O-Douche-Bag said when the SHTF, he will stand(bend over)with his Butt-Muzzies.