The idea that Facebook's "Russian meme/adverts" situation had anything to do with Trump winning is laughable beyond any reasonable measure. He won because Clinton was perhaps the worst candidate in the history of US Presidential elections, not because some Russian trolls wrote some silly crap on FB.
But I agree with your premise...FB is just being used as a big fat scapegoat so the real culprits that engineered Clinton's loss don't lose their cushy political positions.