The real questions are "Was it really Anonymous?" or "Which Anonymous" or better yet; "Who is Anonymous?" since anonymous is not a group. Obviously anyone who does anything anonymously is anonymous. Whoever wrote this Phelps letter is still anonymous because nobody is sure yet who did it, it could very well be that one of the Phelps did it anonymously and blamed it on anonymous!
Before blaming or crediting Anonymous please read this article about the Anonymous~VS~Phelps/Westboro.Empty suit: the chaotic way Anonymous makes decisionshttp://arstechnica.com/tech-policy/news ... isions.ars
Anonymous, no strangers to the art of the troll, largely ignored the bait. In a letter posted to AnonNews on the same day, 20 Anons took jabs at the media for writing up the story based on that initial Anonymous statement. "Just because it was posted on AnonNews doesn't mean every single Anon is in agreement, in fact in this case it doesn't even mean a single Anon is in agreement," they said.
As for Westboro, the letter calls the church's troll a "honeypot" designed to harvest the IP addresses of those tempted to attack the church's websites, presumably with the goal of then suing them in order to drum up even more publicity. The church should be ignored.
Still, Anonymous couldn't let the insults pass entirely without answer. "In closing, let us assure you: We are not BAWWWING sissies, nor are we afraid of your false god; we're just really busy. Stay tuned, and we'll come back to play another day."
But when no one's in control, such pronouncements only matter insofar as they convince others in the group. Indeed, on February 20, some Anon posted the names, phone numbers, and addresses of the entire Phelps clan under the title "West Derpish Derp Church." People were asked to "stop wasting time DDoSing these faggots. They're trolling us, so troll them back."