While the US leadership and especially Biden (because he was personally involved in the debacle), learned from the Kosovo conflict, the American public not so much.
Imagine if San Diego county decided to be an independent country and it's government is friendly with Putin, allowing him to build military bases there.
The western world recognizes San Diego's independence.
What now?
A lot of you would change your tune.
We've seen this same mechanism trigger a war after war, since the 90s.
Best left alone.
It's just a shame that innocent people have to suffer.