But..but..but..it was all our own fault!
The WT explained this very clearly in its issue of July 15th, 1976 when it said:
"If anyone has been disappointed through not following this line of thought, he should now concentrate on adjusting his viewpoint, seeing that it was not the word of God that failed or deceived him and brought disappointment, but that his own understanding was based on wrong premises."
So there you go you miserable apostates. Get your heads on the carpets in supplication and beg for forgiveness!