Comment by opo

That's a funny response to well-sourced facts and a document outlining strategy which was later enacted by the same folks who wrote it.

Plenty of actual conspiracies throughout history:

https://en.wikipedia.org/wiki/List_of_political_conspiracies

https://en.wikipedia.org/wiki/Category:Conspiracies

The existence of modern conspiracies should hardly be surprising. And are precisely the business of intelligence services such as those with established links to the attackers. The attack itself was, by definition, a conspiracy. There's a great deal of conjecture about who exactly was involved in that conspiracy besides the attackers themselves, and a great deal of evidence both concrete and circumstantial. Too much for a single HN comment. But I've made no claims about that beyond "Rebuilding America's Defenses" being conspicuously prescient. Which it demonstrably was.