the Issue is your argument and narrative is not based on "Fact" but Political "Feelings",
Yes the Withdraw from Afghanistan was a ClusteF%K, but to Blame only and Completely a President that Inherited the Situation only 8 month ago is short sighted.
First this Afghanistan has been mismanaged for 20 year under 4 different administration ( during that time Countless of Politicians and Corporations milk it for all its worth.)
But the Hastily made Exit Strategy by the Last Administration was Lacking any real explanation of how to exit.
In fact, many considered that Agreement heavy-favored to the Taliban ( as it not only Ensured Complete American WithDraw, but since it did not include The Afghan govern. it was seen as the Sign That the Taliban was real in power.) including the fact that Taliban were invited to several High rating meetings, 5000+ troops released. This action Ennobled the Taliban
As soon as Feb 2020 after signing the deal, The reports State the Taliban started making deal with Afghan Military and local governments to take it over as soon as the US left
The negotiated surrenders to the Taliban following the Doha deal,
“They saw that document as the end,” the officer said, referring to the majority of Afghans aligned with the government. “The day the deal was signed we saw the change. Everyone was just looking out for himself. It was like [the United States] left us to fail.”
This is a Major Military Intelligence Error, From not only Trump's Admin but also Biden's. As the FEB 2020 Agreement started the Taliban's Rise, it should of never happened.
The Doha Agreement had no details about how the exit would happen (other then limited Troops in timeframes) There was no real exit strategy after that either as The Military did not lay out plans before or after 1/20/21.
The fall of Afghanistain was going to happen no Matter who was President because the Taliban was already "buying" back their Country Since Feb 2020.
Biden Mess up by not Delaying it further but the issue was the Doha was so Public, it was held over his head by the International Community. not only was the Taliban Criticizing not following the Agreement but RUSSIA also Pressured the US to Fulfill the agreement
Taliban visit Moscow, voice hope US will honor peace deal
Russia Says U.S. Troop Pullout from Afghanistan Risks 'Escalation
President Biden Decided to pull the Bandaid but that is a Shared Fault of Both Administrations and the Military itself. As it seemed to be only the Americans that didn't Realized that Taliban already made "Back Door " deals to take over the Country without a shot fired.