People are really crying foul here and that's just silly. I'm more appalled that a sh*tty beer pong simulation that most likely sucks is getting this much press.
Also, I highly doubt Nintendo did this as a "parenting" maneuver. It was most likely a cost benefit analysis. What will effect the company more? Bad press about drinking games on our system, or the sales this game will pull in? I wouldn't let this out if I were running Nintendo.
Now if it was something like... Hideo Kojima's Beer Pong, then the conversation would probably go a bit differently.