Both you and LeeElder make some very compelling arguments. And it is a given that SL will do as he see's fit, in regards what he says to his mother and father. That being said, here is some reverse thinking in the matter.
Leaving the WTBS is a far cry different affair, than leaving your job or local Moose Lodge. Often you try not to burn any bridges with former employer's, mainly for the simple reason you want to keep lines of communication open. This is true with other social/community associations, as well.
The fact is, SL for all intent and purpose, has been df'd by his congregation and family. History and recent info regarding, how family member's are to 'not have anything to do'(no contant) with family member's shunned, really leaves no 'door' cracked. You are persona non-grata, no matter how much love or concern you display.
So although your thoughts about taking the 'shopping cart' away, may in fact have some basis, which is truly showing more love, allowing your loved one's to think, you are still unsure, still ripe for repentance, or the truth? I always think the truth works to shake up the cob webbs in the mind, better than placating or softening the blows.
It is obvious from the tone of his mother, she knows how to give it. It is probably no leap, to think that SL also understands how to talk to his own mother...
I guess the twenty years I have been out, has left me little tolerance for sweeping the truth under the carpet, no matter how distasteful to relatives it may be.
If there was ever any trust between family member's, the words of truth spoken, may fall right into place, at the strangest time. Perhaps the next time they(his parents) are told, read, study the same mind numbing drivel they have for year's, his truthful revelations will penetrate thier brain cells. Almost like the farmer with a 'jackass'....he sometimes used a 2x4 to get his attention.
Softening the blows will only prolong the anguish. For both parties.