The author has a knack for summing up the entirety of the whole piece in the last line! ;-)
Which proves of course, that it's a Conspiracy! By definition, conspiracies are secret. So the more that the Conspiracy Theorist looks for proof without finding any, the more this proves that there really is a Conspiracy!
"Wow! Those secret plotters are GOOD!! We haven't managed to find a single shred of evidence to back up our theories. It surely proves these guys are True Professionals at covering up their tracks!"