If I had the opportunity she has, right now - with all the lead up and background of disability-abuse - I might well take the opportunity to make a documentary about life with dd1, and how she is a human first and foremost, and not deserving of the kind of vile abuse the FB came out with.
I cannot believe that you are all reducing this down to simply 'oh, KP making money again'
I do believe what she says re: how she felt to hear that. as a parent, she had to listen to her son being ridiculed both for his disability, and because she is his mother. she had to hear people laugh when FB said she was fighting to get rid of him - the laugh of recognition that said "shit, yes, who'd want a child like that?" - her child described as un-lovable, and un-wantable, and that's without even going near the rape comments.
try imagining how you would feel in that instance, and thin whether you might want ot try to put the world to rights, if given the opportunity.
I am no fan of hers, by any means. but this whole thing has the ring of truth about it (other than the obvious ghost writing 
) - and it rings true, because I know (thankfully not to the same vile degree) how it feels to be pitied for "having a child like that". I know how it feels to have people wonder how I manage, and why I don't put dd1 into care/residential school. I know how I felt when, on announcing my second pregnancy, I was told "oh, how lovely. now you can be a proper mum" - this in front of d1 as well, as though the years I had been parenting her did not count (of course they don't, she's not a "real" child, is she? 
)