he trawled through hundreds of profiles, twitter feeds, IRC conversations, and basically cyberstalked the hell out of every friend of every person he thought might be a "leader" of Anonymous...This is the stuff pedophiles and con-men do to get closer to their victims might do.
That's also what private investigators and intelligence agents might do. By your logic, all private investigators using the same methods are pedophiles.
If I were deliberately smearing AB, I'd try to concoct a reason to mention him as you do in posts also mentioning "pedophile" and "schizophrenic" as often as possible, only I'd use logic that wasn't such an indiscriminate stretch.
That said, yes, I agree he's an unsavory character. His actions were also likely to get him in trouble. He was totally out of his depth and should've been fired.