10 years ago, I always got a kick out of united players coming back and being part of the coaching staff. It was cool to see Ole, Butt, Phil, Giggs, Mclair .... involved in the team was cool.
Now the culture at the club seems so rotten, No matter who the manger the teams seems to be disjointed, players just seem to come in stagnate and then regress, only play well when there contracts are up and stay forever just kind of gathering dust.
So in fairness to fans its understandable they wouldn't want ex players who have been part of the clearly broken culture at the club being kept on.