The step most people seem to forget when campaigning against shunning is coming up with some kind of legislation that could be put in place which wouldn't be 1,000 times worse than shunning.
Because if you want to be able to force people to associate, it works both ways.
Don't want your JW family round teaching crap to your kids? Unlucky, you can't "shun" them.
In fact why shouldn't Scientologists barge their way in, what right have you to turn them away?
And how is it all enforced ... do government forces point guns at people to ensure you have access to daddies BBQ?
Come up with some workable idea of how to legislate but until then, any campaign is just noise to highlight something and nothing more.
And by "workable" I mean something that doesn't trample roughshod over a million and one other rights and freedoms and doesn't turn the world into a militaristic theocracy.