None Of Which Explains The Just Stunning Intelligence Failure.

https://edition.cnn.com/2021/08/16/politics/biden-afghanistan-speech/index.html

Day 1 they were told. The maximum they would be able to achieve.

They failed to accept that offer. Then spent eight months apparently completely oblivious to the fact they were having absolutely no impact whatsoever.

While everyone else has been watching this happen for more than a month and making preparations.

The US was so spectacularly unprepared. Biden actually thought he would be able to go on vacation this week. 

As recently as Saturday (14/8) morning the US still seemed completely unaware of what was happening.

Leaving them unable to secure their only exit from Kabul, the airport, until 36 hours after the city had fallen.

They're right about this being nothing like the fall of Saigon.

This makes the fall of Saigon look good.