I think it’s one of those things. The whistle’s gone, the defender has gone to clear and it’s hit him in the head. I think [it was] probably the right decision from the referee
That's Wayne Rooney.
Find me a single defender in football, at any organized level, that hasn't once cleared the ball within the second after the whistle goes. You just do it, even though you know in the moment the foot hits the ball that it's a bit late. Normally nothing happens, you get perhaps a "hey, take it easy" from the other team and a "Number x, watch out" from the ref. Nobody cares.
If you look at William's eyes and foot, he is not aiming at all at the head. The ball hits the side of the foot and goes in an angle so it hits Van P. If he wants to give him a real headache there he can, but he would never do it and everybody knows that. Except for Sir Alex, of course. "Oh, don't touch my players or I raise my mighty voice to have FA go after you". Haven't seen a single player or coach on his side this time. Because Williams is not a player to do that also. And FA will not touch it, of that I am sure.
"Should be banned" is a big lol.