Also please take care here, Luke did not roll back anyone's transactions or double-spend or anything like that. He's simply mining all the blocks and not processing more transactions.
Assuming the first statement is true (which is quite the assumption), the second is hilarious!
It's ok to run a DDOS on alt coins now?
Yes it appears so and misuse your users hash power to do it, amazing is it not? The longer this goes on with no reactions against it by the people in a position to make a difference shows just exactly what they are like as well. In their lack of action they show their support for what has been done, so are no better than he who has done it in my books. Their obvious lip service to the supposed goals of the bitcoin project of an open and free environment ring as hollow as that lame defense of his actions you quote.