In any given sport, the one playing the game is not simultaneously the one enforcing the rulebook. Yet in our lives, we all too often decide not to make the attempt if our efforts might run afoul of the (usually unwritten) rules. Let the referees referee. If you're playing the game, focus on playing the game, and learn to foul appropriately. If no one is blowing the whistle, then there's a good chance you're still in bounds.