by Shi Jiangtao in SCMP, Aug 20, 2023The withdrawal of US troops from Afghanistan in the summer of 2021 continues to be seen as a “black mark” on Joe Biden’s presidency – a chaotic and deadly exit that left the war-torn country in a security vacuum as the Taliban swiftly advanced on Kabul. Two years on, Afghans are still struggling under one of the world’s worst humanitarian crises, with most international aid, including from the…