How about putting blame on the stupid policies of both GWB and Obama, which is idiotic regime change. That's what's caused voids, filled by militants originally armed, trained, and financed by the US.
LOL, you’re right. Snowden is not responsible for ISIS. ISIS is due to U.S. allies (for oil and money) Saudis, Qatar and other Gulf States efforts, funding and spreading radical Islam. Even a British General said so recently. Carter facilitated the Khomeinist Islamic regime in Iran back in late 1970s. Not a single U.S. admin has taken any tangible action to remove them since. And, in more recent times, we see another more far reaching Islamic menace not being stopped by the U.S. - the M.E. and N. Africa are playgrounds for the U.S. admins to fuel Islamic factional wars and then pretend to want to stop them by bombing countries in mentioned regions, allowing genocide, killing civilians, and installing more Islamic government.