Isn't it a bit cruel to disfellowship people and have a policy of shunning against such ones just because they don't believe absolutely-to-the-letter the same (fluctuation and changing) doctrines that come from the Governing Body?
Yes.
Jehovah's Witnesses are in existence for the sole purpose of (trying) to change other peoples' beliefs.
So why copy them? For some who leave the Witnesses old habits die hard it seems.