Copied from
this website:
The Premier League released a statement after the match, which read: "The red card for Son was for endangering the safety of a player which happened as a consequence of his initial challenge."
Oh my. If this is the new standard, we should see plenty red cards from now on. Because surely you can endanger the safety of a player without him getting injured? If Gomez had simply slipped and taken a knock, he would still have been endangered, I presume? What if he had twisted his ankle and had to be subbed? Is there any difference?
An elbow to the face surely won't be judged more endangering if the player suffers a concussion than if he doesn’t? A tough tackle can't possibly be punished harder if the tackled player lands awkwardly and dislocates his shoulder, than if he walks away unharmed? Are you endangering a player more if your initially perfectly legal shoulder barge causes a fall and a subsequent arm break?
This is not a can of worms I'd open if I was the PL.