Just to provide a frame of reference: at the Fort Mill vs Mauldin playoff (boys) game two years ago Ft Mill was up by two with about 5 min to go Mauldin (who had been aggressive all game long) was getting very physical and a player made a bad, you can call it dirty but I will simply call it what it was a bad foul that got him a yellow card. Problem was it was his second card, out he goes. FT Mill scores again right way now it is 3-0 game over right? Well the Mauldin players, mostly seniors decided to go out with a bang two more red cards in next two minutes. One included a Mauldin player sitting on a FT Mill player banging the Ft Mill players head into the ground. Ref called the game after third card with 3 min to go, down 3 with only 8 players and they were clearly intent on hurting/ getting FT Mill players red cards, game over.
Next time FT Mill played Mauldin, next season a FT Mill player got his collar bone broken, just a fluke or a dirty play? Those at the game called it dirty but since I was not there I will not judge it. From what I understand FT Mill will no longer schedule Mauldin for regular season games.
So, yes the players sometimes go after players to hurt them no doubt, and refs have/need to see it and control it or it will get out of hand.