so 9/11 never happened then?

con·spir·a·cy /kənˈspɪrəsi/ Pronunciation Key - Show Spelled Pronunciation[kuhn-spir-uh-see] Pronunciation Key - Show IPA Pronunciation
–noun, plural -cies.
1. the act of conspiring.
2. an evil, unlawful, treacherous, or surreptitious plan formulated in secret by two or more persons; plot.
3. a combination of persons for a secret, unlawful, or evil purpose: He joined the conspiracy to overthrow the government.
4. Law. an agreement by two or more persons to commit a crime, fraud, or other wrongful act.
5. any concurrence in action; combination in bringing about a given result.

Even if it was Bin Laden, it's still a conspiracy.