Yes, the memo was correct. It could also have been published every day since the first WTC bombing. We ignored that a war had been declared on us because we had no idea how to combat it. Clinton treated it as a legal issue, which I'm not even criticizing, it was just the wrong tactic. No western power that dealt with terrorism was faced with an enemy like Al Qaeda.
The IRA, Red Brigades, Baader Meinhoff and the Basque seperatists all were the template of how the FBI viewed terrorism. Someone operating inside your borders weren't supposed to fly planes into buildings. We had to learn an extremely painful lesson at home but that lesson had been given us in Kenya, Somolia, in Yemen with the USS Cole and in Suaid Arabia with the Khobar Towers bombings.
There's enough blame to go around on 9/11 for it to be laid entirely at the feet of Bush which the 9/11 commision didn't. I'm not even going to lay it at the feet of Clinton because he failed to take bin Laden from the Sudan. Quite frankly I think Dr. Ayman al-Zawahiri would have pulled off the attacks even if Clinton would have had bin Laden in custody. No single president can be held accountable for the rise of Islmic fascism.
The roots were laid with our support of the Shah after WW II, arguably. That would pin blame going back generations from Truman, Eisenhower, Kennedy, Johnson, Nixon, Carter, Reagan, Bush, Clinton and Bush. We can realistically say our problems in the middle east have to do with how the region has been forced to develop since the collapse of the Ottoman Empire and the actions of the British Empire. It's too long and convoluted to pin on even the 2nd half of the 20th century.