Monday morning quarterbacking Biden's boo boo

From what I can gather the US had a secured airfield called Bagram. Perfectly serviceable and fully functional. The US abandoned it to the Taliban and is now relying on Kabal international to evacuate people? What is wrong with this picture? If I were going to bug out of Afghanistan and I had Bagram I would tell all the people likely to be effected by the bugout to gather at Bagram and I would begin flying them out from there. Of course I wouldn't leave all kinds of weapons and vehicles behind either but that is a tale for a different day.