I think sometimes with older ones it is nearly impossible for them to think about things clearly.
Life at that age gets to be about comfort, really. They like their routines and for things to stay the same.
Who wants to let go of the structure? The social support? The "hope" that it is all true?
So what if you leave your group, leave any chance of "hope" just to be alone and lonely and "right"?
How is that appealing?
The above is what I am guessing older ones feel, so that determines what they will "think".