Well,I've heard more than once,imagine how Jehovah feels when the angels,including Satan,rebelled against Him. So,they go on to say that Jehovah understands what parents with disfellowshipped children have to go through,because He deals with it Himself. And He will eventually destroy Satan and his demons,former sons.
But,again,how can they compare heavenly spirit creatures,to young people raised in the religion.
I bet if most Witnesses heard of other religions having the same sort of shunning policy,they would think it was just terrible. But,they are the exception to any rule,since they have the "truth".
(OT) I watched a movie once with my Witness mother. It was the usual type of movie where the family of the girl doesn't approve of the man she loves because he comes from a different background. My mother,of course,was all for the young couple to be together. And thought the family was foolish to keep the couple apart on such a matter. But,I could see for a split second,that she was comparing it to me,being with an unbeliever. And silence from her for the rest of the movie.
Maybe reasoning on non-Witness examples, can help them see how foolish the Watchtower policies are.