"The left made the military LOSE VIETNAM..."
The military didn't lose that war, they weren't allowed to fight it to the best of their ability (IMO). Much like Korea (and Iraq), Vietnam was not perceived as a direct threat by alot of Americans. If it were a direct threat, all Americans would have been asked to sacrifice for the war effort. They weren't. Why? I think because in Vietnam we were fighting based on a theory (Domino), not a direct threat. I think it's the same now. The theory is if we bring democracy to the Middle East, stability will follow. I'm not sure I agree with the theory. I'm not sure I agree with fighting a war to test a theory. I would rather see our efforts directed toward improving border security and our immigration procedures and use the military to strike down terrorists when and wherever they're located.
"Maybe America isn't worth saving..."
Saving from what? Americans fight best, as a nation, when we are fighting for our survival... we aren't there yet. Perhaps we will be sooner or later and millions of us will die but those of us who remain will prevail. I don't doubt it for a second.
Did the US military lose South Vietnam? There was hardly more than a corporol's guard of US Forces in South Vietnam when the North Vietname Army invaded the South in the spring of 1975. The Watergate Democratic Congress cut off all aid to the South Vietnamese militry and forbad the use of US air power, making inevitable the overthrow of South Vietnam and the resulting bloodshed and oppression.
There is much South Vietnamese bllod on the hands of the Democratic Party, including many members still serving in Congress.