Biden threw out, stopped, or otherwise overturned much of what Trump did in his first term. He could have easily done the same with that Afghanistan agreement--it really wasn't a treaty as Congress didn't ratify it. But Biden chose not to. In fact, he pushed up the agreed dates making the withdrawal faster.
But I can see the reason for that. Biden was in office, either as President or in congress, for nearly 50 years. In that time, he was on the wrong side of every major foreign policy decision made by the US. He was, and is, a foreign policy fuck up.
It was former Defense Secretary Robert Gates who said of Joe Biden in his book Duty: Memoirs of a Secretary at War: “I think he’s been wrong on nearly every major foreign policy and national security issue over the last four decades.” During the last presidential campaign, Margaret Brennan of...
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For example, when Obama learned of Osama bin Laden's location, Biden advised against a strike to get him. Obama delayed his decision for almost six months based in part on that bad advice.
So, that Biden fucked away Afghanistan is just par for the course. He proved, once again, why he shouldn't have been in power. One of our most inept and worst presidents ever.