It is better to make the enemy BLIND, DEAF, and MUTE rather than wait for a lucky moment where we can find some little intelligence about someone and because they are so many of them and because they are very careful to not give sensitive information on the public forums but rather in private chat rooms, and they are taught very well how to hide their IP addresses.
It is better to shut their websites and forums down and simply prevent them from communicating.
Ummm... if we know about the sites and can monitor them, isn’t it better to NOT shut them down?
Think about it - shut them down, lose the intel leads.
It’s sort of history repeating itself back when we cracked the Enigma code and had to decide how much of the information we could act on so the Nazis did not suspect the code had been cracked.
For a great read on that, try Neal Stephenson’s “The Cryptonomicon”