Ferguson does what he believes is best for Man U. The success they have is due soley to what he has achieved. Forget Busby and the legacy etc, all that was long gone when he inherited the club. So for an armchair fan to question the guy after what he has given the club is typiical of Man U fans at the moment. One loss and they say he doesn't know what he is doing!
Ferguson picked the team he believed could beat Leeds while also balancing the squad for the heavy fixture load of Xmas. It was the players who let him down - only Rooney and Valencia bothered in that game.