This cannot continue
Infrastructure attacks on state resources cannot be tolerated, Internet or not.
It is interesting to witness the rise in frequency of this kind of thing. A DDOS on Twitter, or Netflick, annoying as it may be to the users of those services, is not a national security issue. An attack on critical infrastructure is, and governments have a tendency to not put up with that kind of nonsense.
I am almost hoping that this kind of attack will continue in order for critical infrastructure to get its ducks in a row and get the hell off the Internet. The Internet offers near-anonymity in this kind of attack, that anonymity disappears as soon as you have to dial a specific number to log on. Not to mention that DDOS is just not possible anymore, so that's two birds with one stone.
So go on being nuisances, you stupid script kiddies and botlords. In the end, you'll be doing us all a service by forcing our governments to make things more secure.