There was a recent thread on whether the WTS attracts emotionally disturbed individuals which is unlikely to be the case since so many JWs do not fit that description.
Later I thought perhaps the WTS appeals to people that deep inside have a fear of death which is scientifically called thanatophobia (from the Greek word thanatos which means death) an excessive and abnormal fear of death.
What do you think, many JWs find it very difficult to come to terms with the inevitability of their (and everyone else's) death and the WTS plays with this fear and makes them believe that the end of this world and immortality for the dubs are very near.
It's comfortable to know that death has been put at a distance. But if the end is near all the urgency that facilitates the control of the WTS over them remains in place.