The tragedy is when Witnesses reach retirement age totally unprepared. They have been told there is no need (and are criticized if they DO prepare). They are led to believe Armageddon will come in time to save them and they should be in their ministry and not bother their pretty heads about annoying things like earning a living.
And they end up living in Aged Care facilities run by Institutions of Christendom whom they have lambasted their entire life as the Anti-Christ .
Because the JW Religion does not in any way or form look after the aged volunteers that have given their life in serving for the WT religion .
They in effect say the Govt. or Christendoms Religions will take care of you we have better things to do than look after the elderly who have spent most of their life slaving for us.
After all they are only volunteers ,it was their choice to volunteer,nobody made them do it.
And to answer the OP question ,the Mormons ,however the JW`s are the most damaging.