"I just feel sometimes people only hear the side of the "poor me" disfellowshipped one and think "how nasty to shun" family is unloving. The disfellowshipped one makes the decision to leave. ... "
Back-to-front. The person never decides to leave their JW family. The person is undergoing disfellowshipping from a religious community. The person has (usually) broken the community's rules and is no longer accepted as a member of that religious group. On the other hand, the JW family is choosing, influenced by the dictates of the religious leadership, to break off contact with their relative.