We're conditioned by society, I think, to look for smoking guns. But, when it comes to this sort of thing, there aren't any. Everything is a part of the picture. Every piece must fit or else you're looking at the puzzle wrong.
It is a bunch of woo-woo voodoo to attempt to show that they are smarter than all the people who worked on the project over the dozen or so years.
I think it's more ubiquitous than that. I think the "smoking gun" thinking slips into most people, and it's just that some train themselves back out of it.