Not the Marines, but the CIA.
http://en.wikipedia.org/wiki/1985_Beirut_Car_Bombing
It's hard to find such reports given that we're on the side of "god" and "good", but everyone who knows the situation knows the 1985 car bombing was carried out by the CIA.
They were trying to kill one terrorist and his co-conspirators. They failed, but they did manage to kill 80 innocent Lebanese civilians and injure hundreds more.
I understand that you weren't aware of this, but don't pretend to know the history of this region when you don't. Everyone has blood on their hands, and every innocent death is unwarranted. Every action is a revenge for something or other, but none of these actions are justified, NONE, by any of the parties involved. The killing must stop on all fronts, with no excuses.
Hezbollah will tell you their "strike", which was most recently a kidnapping, not a strike, was a retributive act for something Israel did. Israel will say that act was a revenge act, too, a response, to something Hezbollah did. Hezbollah will say that was an act of retribution too. Who the hell are you, or they, or anyone, to declare who had the first strike in a struggle which has been going on since before any of us were born? There's no first strike, and there's no justification for murder, for bombing Beirut, or for bombing Jerusalem either. Anyone who kills innocents is a murderer, as far as I'm concerned.
Fox
PS
Mathematics has nothing to do with this. -2 Israeli lives x -2 Lebanese lives does not equal + 4 of anything, in fact it probably will equal more deaths on both sides, in retribution. So what is that about?