Spring Board
I may be over- (or under-) simplifying matters but here goes.
I believe that in U.S. courts one is allowed to plead guilty with an explanation - "mitigating circumstance". Sound complicated? No more than in my country where one is allowed to defend oneself "not exeeding the agression recieved". Perhaps "terrorism" (the taking of innocent-civilian lives, which I think lies at the core of the definition) can also be taken apart and put into categories of severness.
The Palmach bombed the King David Hotel in order to reach their target. It took the lives of many of their own countrymen as well. Terrorism? Fair game?
The Norwegian partisans sank a local ferry in order to destroy the occupying Nazi forces' transporting of "heavy water". It also took the lives of many civilian Norwegians. Terrorism? Worth it?
Does the fact that these acts themselves were not meant for the express purpose of killing the civilians as apposed to bombing market places, highly poplualted non-military target cities, or towers of World Trade affect the outcome of the deed?
Poland made a futile attempt at defending their country by sending horse-mounted calvery against the German tanks. Suicide.That's all they had.
Is it possible that Al Queida have an ounce of justification in bombing WTC in New York in retaliation for what the U.S. has meted out all over the globe since the end of WWII? Suicide bombers. That's all they have. Are they guilty of terrorism "with mitigating circumstance"?