Ummmm.....that's exactly the point.
I have been stuck in a foreign land during a time of war, and I never once expected the U.S Embassy to save me. Not for one second. In fact I took Embassy assessments with a huge grain of salt based on past experience. They didn;t disappoint.
And no, I didn't whine, either. I did stand in amazement at the American (and Brit, French, Belgian) citizens who thought their governments were suposed to save them from their very own traveling and working decisions.
The U.S. Embassy didn't tell them to go there. Or to Lebanon.
what are Embassies in foreign countries for but to help Americans
Embassies are in foreign countries to protect the interests of the United States Of America. They lots of things (trade deals, military arrangements, etc), so getting individual American citizens out of fixes is (and should be) pretty low on the list of priorities.
In other words, they don't exactly train for, or anticipate, wholesale evacs.
So you're visiting Lebanon on vacation, and a war breaks out....HOW THE HELL ARE YOU GOING TO GET OUT OF THE COUNTRY BY YOURSELF... I will apologize to you profusely if you come up with a satisfactory answer.