A couple nights ago the wife and I got to go see the local premier of "Red State" which involves a cult/church loosely based on the WBC. The director, Kevin Smith (Silent Bob of Jay and Silent Bob fame) was there, and he had invited the WBC to come to both protest and to watch the movie, which they did. One of their representatives was supposed to review the movie for the audience afterward, but apparently they left 15 minutes into the movie saying it was too dirty, and instead the after-show discussion was mostly with a couple family members who had left the church, which was probably more interesting anyway.
But the tie-in to this thread and to your statement on freedom of speech is the part where Kevin Smith congratulated the Phelps family on their recent victory at the Supreme Court. He said something to the effect that even though he didn't like what the Phelps message was, that their victory to say what they say also protects his own freedom to do what he does, and everyone is better for it.
And he's right. When it comes to freedom of speech, the victories that count are the victories don't leave us feeling good about them. The speech that needs protecting is the unpopular speech. While it's tempting to make an exception for the Phelps, if we do then it's just a short step to broaden that exception to the Nazis, the Truthers, and then the communists, and then the Chomsky's, and so on.
Having said that, if Anon decides to pay some attention to the WBC, I won't be upset by it.