Anonymous are worse than the WBC.
On the one hand we have this fairly hateful little cult that goes around upsetting people, apparently for religious reasons. On the other hand, we have another hateful little cult which also goes around upsetting people, apparently for fun. Sorry, "lulz".
The difference? We know who WBC are. We know where they are and who their leader is. This makes them better than Anonymous, because they operate in the open. If the WBC commits a crime, then they can (and will) be arrested. And if you have a reason to sue the WBC, then you can.
Hell, even the Church of Scientology is better than Anonymous. Same reasons. CoS may be a creepy cult, but again, it's all out in the open. The key thing is that CoS and WBC can be forced to take responsibility for bad things they might do. It is the same for all normal, civilised people.
With Anonymous, there's nothing to applaud. They are not activists or protesters, any more than the KKK were. They are bullies, operating under the cover of anonymity which frees them from responsibility for their actions. They are an exclusively destructive force: there is no positive achievement of Anonymous.
Anyone siding with them here should carefully consider their position. Association with Anonymous, even defending them here, will turn out to be to their disadvantage in the future. The organisation will not only be thoroughly discredited, but also shown to be thoroughly evil in nature: capable only of destruction. The mass media will not need to invent anything to do this, just as it was not necessary to invent anything about Nazism to discredit the Nazis. Pure presentation of the facts will be enough. Everyone would be well advised to have nothing whatsoever to do with Anonymous, because such involvement will certainly be regretted in the future.