In regards to previous comments, I don't think he's really been getting used as a 'scapegoat' at all. People are just highlighting the fact that he's often not offered us a lot in midfield, looks a shadow of the player he once was, and hasn't been overly exciting or adventurous in his passing.
That's not scapegoating him. That's just making perfectly valid criticisms. I see it in the Fellaini thread a lot as well, as a defence whenever he's horrendously out of position in midfield, or has an all-round terrible game, and people highlight it. If a player is being scapegoated, then he's generally being singled out for criticism above all other players, whose flaws are thus being ignored. That's not the case for us, since players like Rooney, Depay, Darmian, Fellaini and others have probably (and rightfully) come in for a lot more criticism than Schweinsteiger.