Well, what they did wasn't exactly legal. I think there should be some consequences at least. While it's true that this proved there was a hole in the security, we don't exactly know how they got through it. If they had fake id's made up that's illegal. I mean if you tried to get into a club with a fake id and you were underage, it doesn't matter that your only intention was to have a little fun.
The White House is a government building. Civilians are not allowed in them unless invited for many reasons. They knew this and chose to do it anyway. And if they have all those other suits against them, they may not be as harmless as they seem.
True, it might be overkill to do something like lock them in jail and throw away the key, but at least a hard slap on the wrist is in order. The White House staff don't seem to be saying much though, and I don't blame them.