From Pat Lang at Sic Semper Tyrannis:

“The US will wreck itself if it continues to fight these ruinously expensive wars against the jihadis. IMO the IS wants to build a salafist state across the Middl East and South Asia. To that end they must achieve control of the assets now possessed by Saudi Arabia.

Would IS welcome a chance to inflict as many casualties on the US as possible? Certainly they would but that would be a means to an end and not the end itself.”