Plus, threatening to kill Krebs' wife.
But since we're talking about ethics here: Sure, now that the hacker faces 30 years in prison, he's not short of probably sincere apologies. I could really believe that he now has changed his view and accepted his guilt. It makes me ponder the thought of if I were Krebs' to not only feel sorry for the guy but (if it were legally possible) to dismiss the charges against him.
Consider the much more likely outcome of the hackers' plan: That it worked. Would the hacker had the same sense of guilt then? Or the same sense of forgiveness as Krebs or me seems to have? Maybe. We'd never know unless he did. It's more likely, he would have enjoyed Krebs' ruined live. Maybe even continued to threaten his wife and family. Just for the fun of it.
Because doing that in the anonymity of the web makes it easy to misbehave in ways no one ever would in front of the public eye and even less in the eye of his family and friends.