I don't think the B's care about the book in the face of the $14M lawsuit.
I wouldn't be so bold as to try to suggest what the Bosma's do and don't care about, personally.
Perhaps if it was just about money, one wouldn't care about some small pittance of a donation from the proceeds of the book about their family member's murder because they expect to someday be awarded a judgement of up to $14m. Unless they needed that money for lawyers now to help them win that $14m, then they might care.
Or perhaps they might care just because they care about their charity and they care about the death of their loved one and they may feel that if someone is going to write a book about their loved one's murder, they would hope that it wouldn't be just for the financial profit of the author. If it was me, I would feel that in order to keep the memory sacred, in order not to feel like their death was being exploited for profit, a token would have to be given in recognition of the sacrifice the family makes by having their heartbreak out there for everyone to buy. That is why it is quite normal for authors who write books about tragic events to dedicate a portion to the family of the victim or the victim's charity. I'm not sure why this is surprising to anyone, it's quite normal, it morally ethical and completely legal, hell, it's even a tax write off for the author, not that they should need that sort of incentive.
I know when I am considering buying a work of nonfiction based on a true crime, I need to know a portion of the proceeds are going to the family, otherwise I feel like I am just exploiting the tragedy further. When I buy a book about the lowland gorillas, I expect a portion to go to their conservation efforts, when I buy a book about 9/11, I expect a portion of the proceeds to go to the victim's or the first responders, and when I buy a book about a true crime, I expect a portion to go to the victim's family.
It's not the same as reading a newspaper article, and although it is a job for an author and that's how they make their bread, the subject that they chose dictates whether or not they should be giving a portion of the proceeds to charity. Lots of people are in careers where it is expected that they give back a portion of their pay to a certain cause. Look at how much are teachers expected to spend out of pocket on supplies these days. Do you think doctors who work for sick kids don't give a portion of their pay to the hospitals charities or other causes within their hospital? In some professions, that's just the norm, and you accept that when you picked that job.
But this discussion is probably moot, I'm sure the permission of the family was sought and that a token of respect and gratitude was offered, like normal, I'm just curious why it was said before that the book would be about DM and his early life and not about the trial or crime, and that was why proceeds wouldn't be going to the family. Obviously that's changed so I have to assume the proceeds arrangement has changed too.