You're "spiritually weak" if you don't wholeheartedly buy into the latest false prophecy.
So you give up your home, your job, and your savings so you can go where the need is greatest and pioneer.
But after the prophecy fails and you're left without a job, without adequate insurance, without savings, and without retirement income, the whole thing was YOUR idea and YOUR failed expectations.
You're at fault for running ahead of Jehovah's chariot.
And now you're in danger of becoming an apostate if you entertain forbidden thoughts that the GB was at fault.
The false date, the hype, and the exhortations to give up everything to focus your entire life on field service right before the end of this wicked system of things were "merely an expressed opinion." (Rutherford, 1926)
"In its issue of July 15, 1976, The Watchtower, commenting on the inadvisability of setting our sights on a certain date, stated: '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.' In saying 'anyone,' The Watchtower included all disappointed ones of Jehovah’s Witnesses, hence including persons having to do with the publication of the information that contributed to the buildup of hopes centered on that date." (WT, March 15, 1980, pp. 17-18)
"...persons having to do with the publication of the information..."
This is probably as close as the WT will ever get to saying, "The GB's understanding was based on false premises. They believed their own hype and led many sincere JWs to financial ruin."