I want to follow up STBJ's post with a couple quick points of my own. I continue to be disappointed in Leiter's stance concerning the publius outing. I recognize that Leiter has reason to be sensitive, since he seems to be a lightning rod for vicious, personal, anonymous criticism.*
Leiter continues to defend Whelan's outing of publius, on the grounds that publius had attacked Whelan several times. But it seems to me that whether the attacks were fair and whether the perpetrator can be held accountable for them, are far more important than whether the attacks were perpetrated under a pseudonym. And I think it's clear that publius's attack on Whelan was fair, and that publius himself can be held accountable in spite of the pseudonym. And what seems to be falling through the cracks in this discussion is that publius's attack on Whelan was not publius's. Publius quotes and provides links to two other critical posts, one from Volokh and one from The Anonymous Liberal. It was Volokh who criticized Whelan's point, and The Anonymous Liberal who called Whelan a hack; publius merely acknowledged that Volokh and A.L. were right. So, why out publius, and not The Anonymous Liberal? (Volokh, of course, blogs under his own name.)
In comments here, Jamie rightly points out that anonymity and pseudonymity often cloak abuse, and Leiter complains that such abuse is so common that it contravenes any proposed norm in favor of cloaked speech. I don't see it. I think we can maintain a nuanced view according to which there is no protection for cloaked speech that is also abusive, while simultaneously recognizing the right to privacy and autonomy for non-abusive anonymous and pseudonymous bloggers.
*Part of that is, I think, his own doing. He does not tend to take criticism well, even when it isn't especially vicious. I suspect this, in conjunction with his position as editor of the PGR, makes him an attractive and amusing target for bullies. When I was a kid, I got some good advice about how to deal with bullies: don't be a fun target for bullies. If you're not fun to pick on, bullies won't pick on you.