Prove me wrong, Professor.
You're the one who has to prove your theory. If you had made a statement that Tueni was killed by the Greeks, I sure wouldn't have to prove how wrong you are.
Being Lebanese and having just been there, I am sick and tired of laughable conspiracy theories. Typically, everything bad is the Mossad's fault (didn't you hear about the one that the Mossad was responsible for 9/11, and that Israel figured out a weapon to detonate under the sea, which caused the Tsunami in order to kill muslims?). So unless you have any evidence, I'll stick to MY theory (and a whole lot more people throughout the world) that the country that has been criticized by Tueni, and that had threatened him enough that before the assassination attempt he was staying in France, is the one most likely responsible. They have the motive and the capability (controlling a country for decades gives one the capability to leave a whole bunch of nasty people behind).