They do blame God for their errors:
Stirring up increasing interest in them, Jehovah caused to be preached from 1918 onward the startling public message “Millions Now Living Will Never Die,” and in 1923 he provided the interpretation of “the parable of the sheep and the goats.”
-- Watchtower 15. Nov. 1955, p. 698 § 36 “Millions Now Living Will Never Die” was a false prophecy regarding 1925. The interpretation published by the Society prior to October 1995 stated that the "sheep and goats" were being judged already, since 1918. (Salvation, p. 344; contrast Watchtower 15. Oct. 1995, p. 27 § 21)
As Jehovah revealed his truths by means of the first-century Christian congregation so he does today by means of the present-day Christian congregation. Through this agency he is having carried out prophesying on an intensified and unparalleled scale. All this activity is not an accident. Jehovah is the one behind all of it.
-- Watchtower 15. June 1964, p. 365 § 22
Jehovah is here blamed for all the Society's false prophecies and erroneous teachings.
From a purely human viewpoint, it could appear that these developments could hardly take place before the generation of 1914 disappears from the scene. But fulfillment of all the foretold events affecting the generation of 1914 does not depend on comparatively slow human action. 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. May 1984, pp. 6,7 [brackets in original] Here the Society attributes their own false prophecy to Almighty God.
&c.
