It's a social issue because there are many stories that virtually everyone, at least in the U.S. accepts as true: Hitler was evil, capitalism is good, communism is bad...etc.
The story of 9/11 is that 4 planes were hijacked by Middle Eastern terrorists who flew them into the W.T.C. bringing down the twin towers, the Pentagon and a field
I, personally believe that the twin towers weren't and couldn't have been brought down by the planes but were instead brought down by controlled demolition,
My version of the story could never be widely accepted now any more than Hitler could become a national hero.
First, the majority of the U.S. population would have to admit that it had either been lied to, and fooled, by virtually everyone in the U.S. government and media or that everyone in government and media were fooled.
If they were fooled who were they fooled by?
If the terrorists didn't plan and execute 9/11 who did?
Who could we trust to conduct a new investigation?
Are we prepared, as a nation, to admit that the invasions of Afghanistan and Iraq were not only a tragic waste of money and human life but amount to a completely unlawful unwarranted and ruthless attack on the Middle East?
Could we consider the possibility that our current, unsustainable, plutocratic, fascist, capitalist, corporate, global economy might be the real source of all the mayhem, and that turning the world over to it's richest, greediest, most ruthless and most violent people might not have been a good idea?
Most truths are too painful to accept. "Humankind cannot bear much realitly", T.S. Elliot.