Ref was actually lenient on Brazil. The Dutch penalty kick at 2 mins was a pro Brazil decision. It should have been a freekick just outside the penalty area and a red card for Thiago Silva, as he committed an offence that denied Robben an obvious goal-scoring opportunity. If that had happened, Brazil would have to play almost the entire match with 10 men. In that case, Brazil could have conceited more goals than just 3 since their defense was already terrible to begin with.
See Red card Rule 5.
Me Bad. I cringed when I saw it and was thinking to myself about turning the TV off if Brazil got reduced to ten men as soon. I think the ref might have been thinking of the "big picture" and not ruin it for the paying public and all the TV audience around the world when he chose not to send Thiago off. After all the Dutch coach publically said what most teams would have been thinking in that it wasn't an important fixture and so on.