I would like to tender the suggestion that, to the point that a statistically normal, functional person usually has their parents and siblings involved in their life to rely upon as mentors and guides, even if only to bounce ideas off in times of weighty decisions, the shunned ex-JW has this tool for coping removed from their social toolbox.
In cases of divorce, even a messy, rancorous one, the children often grow up to retain a healthy relationship with both parents later on and can often include their step-parents as their friends as well.
Even in the case of losing both parents, say in an accident, that person has the chance to get themselves through the stages of grieving and finally come to acceptance and with that acceptance, move on and feel a freedom to cultivate surrogate mentors in their life should they see fit to do so.
Thus it is so difficult for the ex-JW to just "let it go". To wish to be loved, or at least included in life by a parent or sibling or spouse who can and will treat you as dead is dysfuction by design.
Eric