The FBI/CIA have to face much more legal hurdles to shut down a website than regular folks like us who send the complaints to the Internet Provider who host these websites. Also I greatly advise that we should also contact the FBI and tell them about these terrorist websites, there is nothing to lose in doing so.
If the FBI and CIA have a decoy websites to attract the terrorists, I think they will make sure that the internet provider who hosts it does not shut it down.
"If the FBI and CIA have a decoy websites to attract the terrorists, I think they will make sure that the internet provider who hosts it does not shut it down."
Not to worry -- they are "the Internet provider that hosts it"...