Why does Barcelona always have it's way with the referee calls?

@barcelonian you are 100% right... if Alvis was to "act" that foul it would be obvuis, his head would have been at a different direction and all the motion would be only or mostly on his upper body, but as you can clearly see that when he spinned his upper body followed his legs direction and not the other way around... oh and my question is why is murinho such a snotty bad sport every time barca beats him and shatters his non valuible reputation