It’s not really “proof”, but go down to the site. There are two negative-space back cubes where the old towers stood. There is a shining “oculus” which is Latin for “eye” next to One World Trade Center (one world government) which is a pyramid when you’re under it looking up. Go see Jeff Koons’ memorial to the first responders. It’s one of his cookie cutter metal ballon dog sculptures. Really respectful. Pyramid plus eye plus black cube is a Masonic (Skull & Bones) trophy or territorial pissing.