I have expressed my opinion on here and shown members where I think the authors have been less than ...... but I have neither left a review on Amazon nor posted about the book anywhere else so I hardly think I can be described as part of an 'online mob'.
As to trashing the author's reputation and livelihood, Summers has been a highly paid investigative journalist for over forty years so I don't think he'll be facing penury just yet and as to his reputation, that would have taken a strike with this book no matter what the sceptics had done ( which is why, I would guess, none of the broadsheets reviewed it ).
IMO Summers biggest mistake was claiming that the accusations that the McCanns had any part in their daughter's disappearance were unfounded in the blurb for his book. Maybe a few years ago that may have sold it but now people are just too knowledgable about the case or too jaded with regard to the McCanns for it to help. The public want the truth about Madeleine and the authors scored an atrocious own goal by telling them they were not going to get it before they had parted with a penny of their money.