He was our kind of guy until he wasn't, an ally during the Cold War until he no longer served our purposes. The problem with Osama bin Laden was not that he was a fanatical holy warrior; we liked his kind just fine as long as the infidels he targeted were not us but Russians and the secular Afghans in power in Kabul whom the Soviets backed.
But when bin Laden turned against us, he morphed into a figure of evil incarnate, and now three decades after we first decided to use him and other imported Muslim zealots for our Cold War purposes, we feel cleansed by his death of any responsibility for his carnage. We may make mistakes but we are never in the wrong. USA! USA!
Kind of like when the CIA assigned the Mafia to assassinate Fidel Castro and the Mafiosi turned out to have their own agenda, or when Pentagon experts anointed the Catholic nutcase Ngo Dinh Diem as the George Washington of predominately Buddhist South Vietnam before they felt the need to execute him. A similar fate was suffered by Saddam Hussein, whose infamous Baghdad handshake with Donald Rumsfeld stamped him as our agent in the war to defeat the ayatollahs of Iran.
Awkward, I know, to point out that bin Laden was another of those monsters of our creation, one of those Muslim "freedom fighters" that President Ronald Reagan celebrated for having responded to the CIA's call to kill the Soviets in Afghanistan. That holy crusade against infidels was financed by Saudi Arabia and armed with U.S. weapons to oppose a secular Afghan government with Soviet backing but before Soviet troops had crossed the border. In short, it was an ill-fated and unjustifiable intervention by the U.S. into another nation's internal affairs.
Don't trust me on this one. Just read the 1996 memoir by former Carter administration security official and current Secretary of Defense Robert Gates, a book touted by its publisher as exposing "Carter's never-before-revealed covert support to Afghan mujahedeen -- six months before the Soviets invaded." This dismissal of the claimed Cold War excuse for the backing of the mujahedeen was acknowledged by President Jimmy Carter's national security adviser, Zbigniew Brzezinski, who, when asked by the French magazine Le Nouvel Observateur if he regretted "having given arms and advice to future terrorists," answered that he did not: "What is most important to the history of the world? Some stirred-up Muslims or the liberation of Central Europe and the end of the Cold War?"