I listened to the game on the radio, the commentators were saying West Ham were flying into tackles from the word go. Boa Morte mainly. time after time tackles were going unpunished, and players were gonna continue tackling that way until the ref booked someone.With that in mind I wouldnt blame the players for getting riled up if punished for a tackle, Its up to the ref to control the game and not let things get out of hand. If you've a strong ref then there wont be as many bad challenges as players will know that they will be punished.The refs should be going around the grounds talking to the players about all this anyway instead of turning up on the day trying to make a name for themselves.