My theory, Andy, is that there's a lot of cowardice among referees. If they can avoid it, they prefer not to make decisions that massively impact the game - giving Casemiro or Shaw a second yellow, or Antony a straight red, for instance.
What that does, though, is massively impact the game by being unfair to the other team, Brighton in this case. They've run Casemiro ragged so he has to commit two yellow card offences - why shouldn't they get rewarded for that?
United fans have kicked up a ridiculous stink about casemeiros correct red card at old Trafford
Non stop, on every platform possible
He knew it. No 2nd yellow
Antony was going around trying to boot people because his cheaty little mate Rashford didn't get a free kick 10 seconds previous before
He knew it. No red
Shaw no 2nd yellow I'm of the opinion he just didn't want to compound the misery
It was a truly abhorrent performance