Absolutely they should, but every time they've had an opportunity for a new start, they've screwed it up.
Anyone with functioning braincells should have realised that TWS should have contained some kind of face-saving climbdown on CBD, saying TW had possibly been misdiagnosed, or the diagnosis was looking increasingly insecure because he was still alive, but that they'd genuinely believed he was terminally ill when they walked the SWCP.
If SW had done that, and, having taken advice from PRH's lawyers, subsequent editions of TSP had contained a tiny note at the back saying 'Our medical advice is now suggesting a different diagnosis, but the book reflects our belief at the time that Moth was dying', TSP would still have sold well, they would have covered themselves, and CH, whose interest was solely initially in the health claims, would never have started investigating and found out all the theft stuff, the retrofitting of the 'diagnosis', the real story of the house repossession etc.
Ros Hemmings and 'Anne' would probably just be seething silently, separately, the two parts of their families would never have realised they'd both been stolen from, and the Walkers' reputation would be safe.
OK, SW would have had to dial down the 'Moth will die if I don't take him on a long walk right now!' jeopardy in the sequels, but she'd have had an ongoing career writing platitudinous books about wild green stuff and how fabulous Moth was, plus her teaching and Gigspanner gigs, plus this wellness empire they were starting.
But no, she had to lean into the 'Moth is even more dying!' narrative in the sequels, and her increasingly outlandish claims, and TW being curiously unavailable for interviews, but looking the picture of health when glimpsed, piqued people's suspicion, someone got in touch with CH, and the rest is history.
At Haye Farm, they should have abided by the terms of their tenancy and made the cider, not consistently refused to do so, and, when things got sticky, made excuses about TW's imminent demise and then cut and run mid-lease, leaving a mess of unpaid bills and an unhappy landlord very ready to share information with Ruth Saberton, Maxine Faramond and CH.
(It would have been still cleverer to say 'Did unspecified bad things I regret that led to us losing our house' in TSP, mind you.)
Which is a long way round of saying that I wouldn't rule out SW not making the intelligent choice and quietly living the rest of her days on her earnings, but putting herself out there again because she feels genuinely put upon and unfairly treated and can't let it go.