Anonymous is not a group, organization, or club. There are no leaders or hierarchy.
Anonymous is not an individual.
Anonymous is an idea.
You compare it to Robin Hood, and it makes sense, but in truth it is more of The Dark Knight.
Anyone can take up the cause of Anonymous, anyone can be Anonymous.
The acts of the WBC were an insult to humanity. Anonymous heard the masses crying out against their actions, the public calling for action. So Anonymous will do as the citizens of the internet decree. Trust them that the WBC will be no more. They have been judged by the public, and Anonymous was the sword.
Obviously, I am a supporter of the ideal.
We are are Anonymous. We are Legion. We do not forgive. We do not forget. Expect us.