Aside from the unloving nature of shunning, why would they want people back who clearly do not believe but are only there for family, friends and/or work?
I understand why the wt/gb would want them as money is still green be it from believers or not but for the real believers, the diehards, why would they want to associate with the riff-raff of unbelievers knowing how they feel about them?
Surely many of the r & f must know the halls are filled with those of questionable faith?
Hope springs eternal? they think if they just hear the right article regurgitated at a meeting the light will dawn and the previously shunned will see the light? That's all I can think of.