We have the right to free speech. If some one chooses to give out info on security arrangments, then it is their problem. A pilot is not going to give away fatal flaws in the aircraft so that terrosists have a better chance of killing him.
If you tighten this forum up, the potential terrorist will still get the info. There are plenty of ways. These terrorists got around the CIA and the FBI. Do you think a some small registration feature would have stopped them? I think not.
Rob