The only reason to do this to Beirut is pure evil spite. Lebanon is so torn up, and just gets kicked by one power after another (including Hezbollah)
Beirut is the capital city, not a Islamist fortification or something. When I was there the locals immediately bought me arak and we swapped stories all damn night.
I have never met the people of another nation as cool, chill, and funny as the Lebanese. I am extremely sad.