The exact words could be traced to a specific conversation and could reveal the method of communication or the person being spoken to. Either way you lose the source and possibly the life of a friend. This is not a trivial matter.
Maybe and maybe not, then again, we do not know if these are really the exact words or not. I assume nothing. Then again it is widely known throughout the world that we listen to everything we can. There was no specifics here. This was more than likely something very simple. So the bad guys know we are listening. I have shocking news for you. They have known for a long time.
I will agree that we need to be extremely careful here. To much information can be a very bad thing. But that does not mean that the American people do not have a right to know what really happened on 911. Becareful yes, blindly follow? NO! It can be just as dangerous.
There really needs to be some way to get limited information out in the public domain. Otherwise its going to get out anyway and more than likely a lot more than one wanted. Control the output, not close it down.