Much as been revealed over the years to the date setting doctrines made by the WTS. such as ( 1874, 1914, 1925 , 1975 This Generation, The Last Days, The End Times etc.... which were not created by other Christian based faiths.
As to critically examine why might reveal a hidden agenda to all these date setting proclamations.
The point in question is did the WTS and its leaders intentionally manipulate or exploit the preaching of the Gospel to enhance the proliferation of their own printed publications ?
I would say convincingly yes, no question.
Whats your viewpoint ?