Widely blamed: WP

"Assad is widely blamed for backing extremists in order to undermine legitimate opposition to his government." Widely blamed by whom? In fact, in the Middle East region--rightly or wrongly--the US is in fact "widely blamed" for backing extremists to provide pretexts for wars and invasions.  Yes, the Free Syrian Army staffers at the Beirut offices of the US media do peddle the theory that the Syrian regime does not attack ISIS but there has not been one evidence presented of the regime's complicity with ISIS, or for what the Post calls--without evidence--"backing extremists".  By the way, the regime yesterday attacked ISIS sites but I did not read about that in any US newspaper.   Also, Washington Post: Are Saudi Arabia and Qatar "widely blamed" for backing extremists?