Any thought process that deals with death must have some effect on people even after rejecting the whole package of teaching, but I think it affects some more than others.
For example someone I know left and DA'd 16 years ago but still is in daily fear but I left only 18 months ago but only have small problems about Armaggedon occasionly -why?- because I re educated myself on the source of the teaching and gradually built up an armour against these feelings.
It's a bit like cognitive thinking , I look at the potentially damaging thought and reason on that thought whether it is valid - for instance would a loving god kill billions of people that are not neccecarily living bad lives by his standards when they have never heard of him because he sends as a whole preachers to most of the population ,hardly ever ,and to the smaller number of the population all the time? In the bible it describes the cruel and graphic way people are to die en-mass for lack of knowlege ,if this is the real god ,the one the WTS descibes then I don't want to serve this one forever with people who are in line with WTS thinking ,I could'nt think of anything worse.
In this way you can kill off the thought processes than enslave one to fear.