DH edited this paragraph
It was always unrealistic for the US to achieve any peace in Afghanistan without sustained political agreements between, not only the Taliban and Afghan government, but the Russians, Chinese, Iranians, Pakistanis, Turkmen, Tajiks and Uzbeks. That's what diplomacy is, agreements with people you do not share the same ideas and outlook, and likewise regional stability can only be achieved in conjunction with the country’s neighbours. Afghanistan has a complex and violent history that is by no means contained within its boarders, and civil war there risks igniting old feuds between Pashtuns and neighbouring Tajiks. Likewise terrorist networks in Afghanistan have long led to attacks outside the country. A national building exercise in isolation surrounded by hostile authoritarian states is therefore nonsensical, a modern peaceful Afghan state could only ever have happened through true cooperation, diplomacy and good international relations. The US and their NATO partners are ultimately to blame for the mess in Afghanistan, as they never pushed for better collaboration or true diplomacy in the region and covered up failures while making up progress.