It's always best to obey your laws when doing activism. Having said that, there are people who may/may not break the law in their activism. Most often activists are threatened/charged with harassment when confronting or outing Jehovah's Witnesses. But hacking to get the pedophile database is a different legal matter than harrassment.
There are all kinds of activism that people do. Quite a few people are quick to scream that the methods are ineffective and don't work. Others scream persecution with gusto and vigor. And then others just scream something to have a chance to disagree with something or someone.
When you've got child rape, murder, pedophilia and more going on in a toxic cult, the answers to the solutions aren't always black and white. You've got a nasty cult that refuses to budge on their criminal activity to their own demise, detriment and destruction.