The author of a new book written in collaboration with the mother of the murdered Kahui twins has accused a group opposed to its publication of developing a "lynch mob" mentality.
More than 21,500 people have signed up to a Facebook group urging the mass boycott of 'Breaking Silence', authored by Ian Wishart.
It gives Macsyna King's account of the circumstances surrounding the murder of her three-month-old sons Chris and Cru Kahui.
The boys' father Chris Kahui was accused and acquitted of inflicting fatal injuries on the twins in 2008.
His legal team contended Ms King carried out the murders.
Mr Wishart has spoken out against the angry Facebook posts on the 'Boycott the Macsyna King Book' page in an interview with TVNZ.
Many of the posts accuse Ms King of profiting from the death of her sons and call for violence against her.
"There's an awful lot of hate in there. There's an awful lot of mouthing off. It's like a lynch mob," Mr Wishart said.
"We've got to step back and say 'okay, let's hear what Macsyna has to say'. Let's see what comes out of the book.
"If we sit there and burn books and burn witches and drown people and all the rest of it. Put bullets through their head as they're suggesting on the Facebook page, we're not going to learn anything."
Mr Wishart said he understood the outrage of the people in the group.
But he called for them to read the book before judging its contents.
"She is the first person to admit 'I was the world's worst mother'.
"The book is... very revelatory about how this person became dysfunctional."
Ms King was not getting any money out of the book, Mr Wishart said.
He said he would be collecting profits from sales, but most would go to book stores and he would be left with a "wage on the table".