I can imagine rallying to protect a writer who'd done her best to rebut the claims against her, but so far SW hasn't done that. In fact, she seemed to have backed up quite a lot of them herself.
Ultimately there are points that have come up that are in the realm of artistic licence, but it was seriously misguided to write a book that suggested hope to people with a chronic degenerative condition, or to their families. For very good reason, there are rules and laws about that. Was it one person's experience? Now that is doubtful and the details are in question. It's personal to people.
I said at the beginning, people bring emotion to their reading, and experience emotion with certain works. If this were a fictionalised memoir (which actually it seems to be) and not sold as a work of truth, we wouldn't be nearly 2 weeks into the story and still finding things that don't add up. That would be a 'well what did you expect?' story. But I think a lot of people feel they've been tricked. There's dishonour as well as dishonesty.
Must be pretty awful/at least annoying for the couple. Obviously they've also caused some pretty awful feelings for people they've met along the way. Quite possibly they're not huge internet users and are unaware of how things like this go nowadays.