For the record, this famous photo isn't of the US embassy in Saigon, but of an apartment house where CIA types lived. They took as many of their Vietnamese allies with them as they could, but that wasn't many. What happened to the rest, we can only guess, but an informed guess isn't pretty.
Now, it's getting to be our perception that there are no good guys left among the Iraqis, so when we leave and our putative co-workers for peace and freedom are slaughtered, we shouldn't feel too bad about it.
Besides, the United States has a history of this sort of thing:
---In 1956, encouraged by John Foster Dulles, not to mention President Eisenhower and Radio Free Europe, the people of Hungary revolt against their Soviet masters. The CCCP's tanks roll in, 4000 die, and the US does nothing.
---In 1961, John F. Kennedy and the CIA send a band of Cuban exiles onto the beach of the Bay of Pigs to reverse Fidel Castro's revolution. Kennedy gets cold feet, the exiles are left on the beach, and they either die on the spot, get shipped off to Castro's prisons or are simply executed.
---American troops had actually been withdrawn from Vietnam by 1973. "Vietnamization," the people defending themselves, was actually a success for 2 years at least. It was the US Congress' (to this day inexplicable, except that we got bored and tired) cutoff of funds to South Vietnam that led to the events in the above photo in 1975. Then boat people, re-education camps, death.
---In 1979, Jimmy Carter not only withdrew support from the Iranian Shah Mohammad Reza Pahlavi, Carter threw him over the cliff, to the shock and awe of the West, including even France. The Shah was not only a US ally, he helped out in defeating Hitler back in the day. You could look it up.
Not only did Carter withdraw US military and political support, and forbid the Shah's forces from confronting his Khomeneist enemies, but the leftists who went along in the name of freedom got slaughtered by the new Islamicist regime, and you could look that one up, too.
---In 1991, the Bush41 administration gave nods, winks, and open encouragement to an uprising against the same Saddam Hussein whom the First Gulf War had left in place. The people rose up, the US did nothing, and slaughter ensued.
---We might also add that Ronald Reagan put US troops into Lebanon in 1983, 241 US troops got killed in a bombing, and the US withdrew 4 months later. Hezbollah, whether responsible or not, takes fortification to this day that they defeated the United States, and particularly Reagan, who is otherwise reputed to have never lost a tussle. And Bill Clinton sent a skeleton crew of US Army Rangers into Somalia in 1993, they were killed, and we promptly quit the country. Osama bin Laden crowed about our defeat and withdrawal often as a sign of our weakness, and the movie Black Hawk Down became one of Saddam's favorite flicks.
But never mind that last bit. The US quits all the time and leaves allies and other good people out to dry, so why not bail this time, too? It's in our character. I'm bored and tired with Iraq, who isn't, and what's one more betrayed ally among friends, or to our enemies?
Bin Laden is a student of history, and so is the entire Muslim world. They sussed out the paper tiger long ago, and that's what makes Islamism go. Their faith tells them that Islam must someday become the way of the world, but that could be in a 1000 or 10,000 years, sort of like Christianity's prophesized Second Coming Of Jesus. But the fecklessness of the west tells the Muslim world that that day, the end of times, might be right frigging now.
But, hey, the United States survived all those other regretful embraces of realpolitik, so one more won't make any difference, right? We still have our toasters and our TVs and our steel-belted radials, after all, so why should we say anything? Surely we can survive one more betrayal in the name of realism.
Iraq is boring, let's face it. To those Iraqis who actually believed we were liberating you and would get your back as you risked your lives for peace, freedom and human decency, sorry, you're on your own. You screwed up---you trusted us. You should have known who and what we are. Bin Laden understands us, far better than we do ourselves.