Your topic reminded me of some observations from a book I read some years ago (part of my snail-paced exit from JWism)(please pardon the long quote, from Why Conservative Churches Are Growing, Dean M. Kelley, 1972, Harper & Row):
WHO RESPONDS TO A HIGH DEMAND?
We have noted that the strong religious organization makes very high demands on its members. They must give it absolute and unswerving allegiance; be willing to work, suffer, and die for it; abandon all competing activities, allegiances, and responsibilities in its favor; tell its Good News tirelessly and unselfconsciously to strangers; wear its stigmata of humiliation on their bodies; submit to its strictures, conformities, and disciplines; go where they are sent and do what they are told. Not everyone responds favorably to such demands, some are in fact repelled by them. What are the causes and consequences of this differential appeal?
Max Weber in his Sociology of Religion refers to those who are willing to give religious interests such an exceptional proportion of their energies as "virtuosi of religion." Apparently he felt that some people will excell [sic] at that sort of thing and others won't. He did not attempt to explain why some are virtuosi and others not, since that would have led him astray into individual rather than collective traits, and he was writing a sociology rather than a psychology of religion.
Eric Hoffer has suggested that the "true believer"--the candidate for fanatical (high-demand) religious movements--is the person who, for one reason or another, feels that his life is "irremediably spoiled" and therefore clings obsessively to a movement that can supply significance and purpose for his life which it lacks in itself.
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It is neither necessary not appropriate here to evaluate the psychological soundness of Hoffer's diagnosis. Although sweepingly aphoristic, it is a magnificent contribution to the sociology of mass movements. As another effort to make a sociological contribution, this work cannot try to determine the psychological motivations of individuals--whether they seek significance in total allegiance to a high-demand movement solely because they feel they have no significance within themselves. For our purposes we can disregard the final clause--let those affirm it who prefer--and simply say there are many kinds of conditions which can lead or drive individuals to sacrifice themselves to a source of significance outside themselves. Thus we do not prejudge or denigrate any of them. The fact remains that there are such people; what their motivations may be we need not now determine. History and experience suggest that they are not numerous: those persons who, for whatever reason, are potentially receptive to high-demand movements. Perhaps one in a hundred or one in a thousand.
JWs are one in 10,000.