weev is a troll (in the 4chan sense), and a performance artist, but on this issue, he's actually being pretty straight up. He got some information about a security vulnerability, was asked to publicize it, did so, and is now being unlawfully screwed for it.
Was what he did prudent, especially for someone already on the FBI shitlist? No. Was it lawful? Yes. And, it certainly brought the security vulnerability, which was an incompetent decision by ATT, to public attention.