Nobody is addressing an important point - when Biden reneged on the May 1 pullout of troops, the Taliban went to the tribes and got support to do what they are doing. This is on Biden for breaking the deal, which he stated back in April and knew the Taliban were pissed off by it.

From: https://fas.org/sgp/crs/row/R45122.pdf and Tony Shaffer echoed this.

"On April 14, 2021, President Joe Biden announced that the United States would begin a “final withdrawal” on May 1, to be completed by September 11, 2021. In a written response, the Taliban accused the United States of breaching the February 2020 agreement and stated that the U.S. decision to stay beyond May 1 “in principle opens the way for [Taliban forces] to take every necessary countermeasure, hence the American side will be held responsible for all future consequences.”"