Here's the comparison.
In 1973, the USA and North Vietnam signed a Peace Accord. Simply put, the terms were that the USA would withdraw from SV. NV would not accelerate their campaign to conquer SV. Under the terms of the agreement, the USA would re-join the fight, if NV accelerated their military campaign in SV.
After the ink was barely dry, NV stepped up their offensive and conquered SV. The US Congress refused to honor the pledge to re-enter the fight, despite the fact that NV violate the agreement.
There were never any domestic political repercussions from this abandonment of SV.
Now, fast forward to today. The USA has a pledge and obligation to defend South Korea against their aggressive northern neighbor.
What's to stop the USA from abandoning South Korea?
If it was "OK" in a domestic political sense to abandon South Vietnam, could those same conditions replicate themselves today, such that, it would be "OK" for today's US politicians to leave South Korea to its fate?
This post was edited on 3/30 at 9:32 am