Who would a player who has held down a spot at United, was a starter for England not too long ago, and is still at good age, potentially improve if he can get into some sort of form again? You say it like I need to justify something, but it's not too difficult to imagine it's quite possible.
My main point is that he in no way as bad as some make out, and he has always seemed to be an easy target, now we have extended his contract, most likely for resale value, and the same old nonsense comes out, he's not that bad, in fact at times he's been quite good, and will find a home at decent club hopefully, will probaly find some form again, and United might get a decent fee, he may even come in handy before the end of the season for us at some point yet.