The older JWs spent a long time convinced that the end was imminent, and if that meant cutting off communication with loved ones, so be it. The end would come soon and it was not worth it to risk losing out. And then the years pass, and nothing happens, and one day they are old and realize that they haven't talked to their children in decades and never met their grandchildren and suddenly they wonder why the end hasn't come.
Sadly, a lot of them will dig in their heels because those decades of shunning are a sunk cost and they can't risk it because now the end must be imminent and wouldn't it be a shame, etc. Others finally reach out, crushed because they realize that they'll never get that time back, and they missed out on so much. It damages people and relationships. Shunning is evil.