I watched a US general being interviewed a few days ago and he said although Trump initiated the withdrawal it had strict conditions attached and the Taliban knew if they reneged on the agreement Trump would act. He actually said Trump was tough but his manner wasn’t in keeping with a statesman and let’s face it, he wasn’t a politician. This general did make it clear that this fiasco wouldn’t have happened if Trump had been POTUS.
Incidentally, one doesn’t have to be a Trump supporter to acknowledge his handling of this crisis would have been preferable to Biden’s.
Additionally, I have read and heard from several sources that this withdrawal is popular with the US public and Biden, conscious of the upcoming mid terms, doesn’t wish to lose votes. How he sleeps at night is beyond me. Let thousands, if not millions, suffer but staying in power is paramount. Sickening and I hope it backfires on him.