Do you realize that the invasion of Grenada was already started?
Do you realize that the Soviet Union is gone, global nuclear annihilation gone, Europe freed, and that the Middle East would still be a mess?
Quit fantasizing about whatever you are imagining and look at the impossible dream that actually came true.
Those things have nothing to do with what happened in Lebanon in '83. The CIA was still a functioning organization back then. There was detail intel on who did this horrible thing. We knew everything, where they were and who they were. The intel said they were expecting huge reprisals from the Expeditionary force. Targets were plotted and attack plans were ready to go. You do not know the whole story.