Oh I'm sure there is plenty of blame to go around, but as far as this withdrawal fuckup goes I don't think we can go back 20 years and say well this is all Bush's fault.
I don't think Biden is solely to blame for the Taliban taking over, I'm sure that was bound to happen no matter who was president. How fast that would have happened and how many people we would have left stranded I think would have differed greatly depending on who was president.