The only conclusion we can arrive at is: all of Watchtower's false prophecies/failed dates are god's fault:
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The Watchtower, March 1st , 1965 p. 151 Basis for Reliance on Prophecy
"The best method of proof is to put a prophecy to the test of time and circumstances. The Bible invites such a test. "The Watchtower is not the instrument of any man or any set of men, nor is it published according to the whims of men. No man's opinion is expressed in the Watchtower".
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"Jehovah's Witnesses, in their eagerness for Jesus second coming, have suggested dates that turned out to be incorrect. Because of this some have called them false prophets. Never in these instances, however, did they presume to originate predictions ' in the name of Jehovah '. Never did they say, ' These are the words of Jehovah'." (AWAKE! 22. March 1993) (note: notice how when things go south, suddenly it's not Watchtower's fault but "Jehovah's Witnesses" fault as a group).
Oh, really?
> "This chronology is not of man but of God . . . of divine origin . . . absolutely and unqualifiedly correct." --Watchtower 7/15/1922, p.217
> "Jehovah's prophetic word through Christ Jesus is: "This generation [of 1914] will by no means pass away until all things occur." (Luke 21:32) And Jehovah, who is the source of inspired and unfailing prophecy, will bring about the fulfillment of his Son's words in a relatively short time." (Watchtower 15. March 1984, p. 6 [brackets theirs!])
> In the November 15, 1955 Watchtower President Knorr went so far as to say that God was the One who was responsible for the preaching of Rutherford’s message ! Under the heading, "Jehovah Is In His Holy Temple" it says …
Stirring up increasing interest in them, Jehovah caused to be preached from 1918 the startling public message, "Millions Now Living Will Never Die."