Maybe I will sound too "newfaggy" here, but can someone explain to me how spamming CP on imageboards and forums doesn't get the cops involved? I know about the "FED's are allegedly doing it to sites they don't like" meme. But here you got one that has a public endorsement to do that to another site (brigading). Isn't that the same as inciting a crime?
I can actually answer this one.
What cops would you have to deal with it? Bear in mind, the users and owners are multinational, some in countries where the idea of this sort of content isn't considered the forefront of their main concerns. Not only do you have to identify where the main distributors live along with the admins and moderators, but you have to also juggle the various police forces in tandem, because, multinational. And it's not inciting a crime, it's pretty much open plausible clause like someone screaming out a window "I've got a gun, and I will shoot!" It's a crime in progress, not a call to incite.
However, as much as intelligence communities want you to believe in it, there is no super secret global police force that can arrest you no matter where or when, it's all a very specific game of jurisdictions, and communication that not everyone plays ball with.
That being said, Interpol is the closet thing you are going to get to a mobile global police force, followed up by the 5 Eyes Intelligence Community Net (5 Eyes of God.), followed by Banjo and Kazooie (Codename for the intel team up that is China+Russia) If you've one of them on your ass, you fucked up big time; if you've got all three of them, holy shit what the fuck are you doing bro?