Trump said the consequences of an exit from Afghanistan "are both predictable and unacceptable. 9/11, the worst terrorist attack in our history, was planned and directed from Afghanistan because that country was ruled by a government that gave comfort and shelter to terrorists. A hasty withdrawal would create a vacuum that terrorists, including ISIS and al Qaeda, would instantly fill, just as happened before September 11th."
In order to believe this, facts must be put aside and the official version of events be unquestioningly accepted. There is no evidence the attack of September 11 was "planned and directed from Afghanistan." Then Secretary of State Colin Powell said two weeks after the attack he would "in the near future… to put out… a document that will describe quite clearly the evidence that we have linking [Osama bin Laden] to this attack."
However, the following day during a press conference in the Rose Garden with President Bush, Powell said the American people would not be permitted to see the evidence. He added the United States had irrefutable proof of bin Laden's complicity, but "most of it is classified." Powell's remark was an effort to conceal the fact the Bush administration had no evidence Osama bin Laden planned and orchestrated the attack from a cave in Afghanistan. Investigative journalist Seymour Hersh cited officials from the CIA and the Justice Department as saying there was no solid evidence of this.