"Plaintiffs should be able to sue harassers under pseudonyms to protect their identities"
Most pointless thing ever. Unless you're going to sue them on live television, there's noone to protect your "identities" (might i take a moment to say, wtf? You are one person. Not several.) from.
Who, the judge? Judges don't give away that kind of information to people. The defendant? The defendant is going to instantly know who sued them, pointless. The jury? Pointless again, they're just random people. Plus, I'm pretty sure that somewhere along the line you need to sign your actual name for legal documents.
It's coming from the sameplace as the similar argument regarding victims of rape or loveual assault/abuse.
They don't want their identities revealed, because it's too embarassing or painful to let everyone know they were raped/abused, and that everyone would think of them in relation to that affect. It becomes a stigma they can't get away from. It's similar to the way in which the identities of physically/loveually abused children are kept hidden, to protect them later on in life.
In some ways it's a good idea for that scenario, where many people are too afraid to come out about being a victim of rape or abuse.
But applying it to people who have been harrassed online is just absolutely pathetic.
If anything you should be named and shame for being too weak-willed or stupid to just turn off your computer, or block a user.
It servers no purpose in these cases to protect the identity of the abused.
For goodness sake, it's your own fault if you were out there giving away your full name and details on the internet anyway.
If you wanted anonymity then you should have used a pseudonym BEFORE you were harrassed, not AFTER.