A theory you don't often see explored re: the alleged suspicious trading is it may have been connected to 9/11, but only in the sense that those people making the trades were some of the few paying attention to the threats being made against the US and happened to make a decent bet on how they'd manifest, similar to the guys in The Big Short.
I think it's unlikely, but it's more plausible than some of the theories suggesting a vast conspiracy.
We've talked about this somewhere on here before. How wars, natural disasters and so on are reduced to numbers going up and down when you live through the market. It becomes a game where the players are completely detached from the action.