I have to say I have sometimes wondered this. I suppose the way I would describe it is that they have all their buttons but some are undone.
They are probably more vulnerable and more susceptible to the talk of having their heart's desire in the New World.
However, maybe for this kind of person the KH is not a bad place to be because on the plus side they are told what to do which they probably need, they may not be as sensitive to all the politics that go on in the Organisation and therefore not upset by as much. Furthermore, maybe they wouldn't otherwise go out and they are probably given lifts to the assemblies and so forth.
Perhaps they are not the best people to go out in FS though.
OR
Perhaps belonging the JWs has made them this way. I must admit if I had spent any longer going to those meetings and trying to please everyone I would begin to shut off to the world.
Not sure, interested to hear other's thoughts.