All sides bear blame.
A close buddy of mine, who served years in the U.S. Army and Army reserve, told me that once we booted the Talbiban in 2001, we at most should've stay a few more years, leaving the Afghans to build their own country.
At NYT, "Taliban Sweep in Afghanistan Follows Years of U.S. Miscalculations":
WASHINGTON — President Biden’s top advisers concede they were stunned by the rapid collapse of the Afghan army in the face of an aggressive, well-planned offensive by the Taliban that now threatens Kabul, Afghanistan’s capital. The past 20 years show they should not have been. If there is a consistent theme over two decades of war in Afghanistan, it is the overestimation of the results of the $83 billion the United States has spent since 2001 training and equipping the Afghan security forces and an underestimation of the brutal, wily strategy of the Taliban. The Pentagon had issued dire warnings to Mr. Biden even before he took office about the potential for the Taliban to overrun the Afghan army, but intelligence estimates, now shown to have badly missed the mark, assessed it might happen in 18 months, not weeks. Commanders did know that the afflictions of the Afghan forces had never been cured: the deep corruption, the failure by the government to pay many Afghan soldiers and police officers for months, the defections, the soldiers sent to the front without adequate food and water, let alone arms. In the past several days, the Afghan forces have steadily collapsed as they battled to defend ever shrinking territory, losing Mazar-i-Sharif, the country’s economic engine, to the Taliban on Saturday. Mr. Biden’s aides say that the persistence of those problems reinforced his belief that the United States could not prop up the Afghan government and military in perpetuity. In Oval Office meetings this spring, he told aides that staying another year, or even five, would not make a substantial difference and was not worth the risks. For Mr. Biden, the last of four American presidents to face painful choices in Afghanistan but the first to get out, the debate about a final withdrawal and the miscalculations over how to execute it began the moment he took office. “Under Trump, we were one tweet away from complete, precipitous withdrawal,” said Douglas E. Lute, a retired general who directed Afghan strategy at the National Security Council for Presidents George W. Bush and Barack Obama. “Under Biden, it was clear to everyone who knew him, who saw him pressing for a vastly reduced force more than a decade ago, that he was determined to end U.S. military involvement,” he added, “but the Pentagon believed its own narrative that we would stay forever.” “The puzzle for me is the absence of contingency planning: If everyone knew we were headed for the exits, why did we not have a plan over the past two years for making this work?” A Skeptical President From the moment that news outlets called Pennsylvania for Mr. Biden on Nov. 7, making him the next commander in chief for 1.4 million active-duty troops, Pentagon officials knew they would face an uphill battle to stop a withdrawal of American forces from Afghanistan. Defense Department leaders had already been fending off Mr. Biden’s predecessor, Donald J. Trump, who wanted a rapid drawdown. In one Twitter post last year, he declared all American troops would be out by that Christmas. And while they had publicly voiced support for the agreement Mr. Trump reached with the Taliban in February 2020 for a complete withdrawal this May, Pentagon officials said they wanted to talk Mr. Biden out of it. After Mr. Biden took office, top Defense Department officials began a lobbying campaign to keep a small counterterrorism force in Afghanistan for a few more years. They told the president that the Taliban had grown stronger under Mr. Trump than at any point in the past two decades and pointed to intelligence estimates predicting that in two or three years, Al Qaeda could find a new foothold in Afghanistan. Shortly after Lloyd J. Austin III was sworn in as defense secretary on Jan. 22, he and Gen. Mark A. Milley, the chairman of the Joint Chiefs of Staff, recommended to Mr. Biden that 3,000 to 4,500 troops stay in Afghanistan, nearly double the 2,500 troops there. On Feb. 3, a congressionally appointed panel led by a retired four-star Marine general, Joseph F. Dunford Jr., publicly recommended that Mr. Biden abandon the exit deadline of May 1 and further reduce American forces only as security conditions improved. A report by the panel assessed that withdrawing troops on a strict timeline rather than how well the Taliban adhered to the agreement heightened the risk of a potential civil war once international forces left. But Mr. Biden, who had become deeply skeptical of American efforts to remake foreign countries in his years on the Senate Foreign Relations Committee and as vice president, asked what a few thousand American troops could do if Kabul was attacked. Aides said he told them that the presence of the American troops would further the Afghan government’s reliance on the United States and delay the day it would take responsibility for its own defense. The president told his national security team, including Secretary of State Antony J. Blinken and his national security adviser, Jake Sullivan, that he was convinced that no matter what the United States did, Afghanistan was almost certainly headed into another civil war — one Washington could not prevent, but also, in his view, one it could not be drawn into...
Still more.