Conspiracy theorist gets to heaven and is greeted by God at the gates
God - Ask me your question, the one question that troubled your whole life so that you may enter heaven untethered by the doubts that troubled your time on earth
Conspiracy theorist - OK, who conducted 9/11?
God (looking annoyed) - It was actually the Taliban that did 9/11, led by Osama Bin Laden who masterminded the whole thing. The incompetent government at the time made mistakes that allowed it to happen but they were not in on it all.
Conspiracy theorist - hmmm, this clearly goes higher than I thought