John Harris should stick to wakening people up about the real world and stop writing works based on fiction
Having just finished reading Graham Hancock's first fiction book 'Entangled' I would disagree that writing about fiction is less valuable than writing non-fiction in some instances.
As most of us know, when we try and explain some of the more 'esoteric' idea's to the complete laymen, their 'bullsh1t' barriers will spring up and they will very soon switch off........however, if the information is given in the form of a story then these same 'bullsh1t' barriers aren't used........and otherwise esoteric idea's can be passed to the reader in a very subtle way.
I haven't read John's book, but I am assuming that this might be his reasoning behind writing fiction........and perhaps he might wake up more people to the real world by writing fiction

"Almost all people of all eras are hypnotics. Their beliefs are induced beliefs. The proper authorities saw to it that the proper belief should be induced, and people believed properly."— Charles Hoy Fort.