Exactly. Even at the time, it was clear to rational people that this was deliberate. The only thing in question--and I'm being generous here--was motive. Giving any latitude for tying oneself in knots to call it the isolated act of a despondent individual expired on Sept. 11, 2001. Continuing the charade 10 years later is laughable.
It also probably created the idea.. If a crazy Muslim would crash a plane into an ocean, why not get some even more crazy Muslims to take over a a plane and crash the plane into a city / building.. TaDa 9/11 plot hatched.