I don't know the technicalities of the law as to exactly when someone can be picked up for that type of planning. It seems to me it would be a problem to arrest people for thinking about a crime or even putting plans down for it. For example, I had a friend who realized his local bank had a security issue. He mapped out a detailed planned on how to thwart their security system and then turned those plans over to the bank manager. He had no intention of actually carrying out the crime. As far as I know, you can plan a crime all you want but not be arrested until you act on it. There might be some exceptions, as in the stalking laws.
I don't know what your point is... bin Laden commitment the acts of terrorism period end of story.
Sara
Sara
"I never give them hell. I just tell the truth and they think it's hell." - Harry Truman