Do you not think that it's bullying to write a book in which you reproduce, word for word, private conversations that you say your relatives have had?
If somebody did that to your sister or mother, say in a work or hobby context, would you not feel worried for you relative's mental health?
Does it not affect you that the Royals are not doing the same back, and giving their self-justification and side of the story - that the harassing and dragging down by Harry is all one-sided?
The NHS might collapse, as we know it. Also, as a result of Harry's public memoirs, so might The Royal Family. If you believe in the democratic checks and balances to power, which are supplied by a constitutional monarchy, that will be worrying to you and worthy of giving your attention.
At lot of people who post feel that they are pushing back against all that Harry is claiming, in order to be fair to the Royals, who are human beings too. It must be very difficult to deal with the shade he is throwing and unkindness, if you are Catherine. We are told that the Royals cannot answer back, due to protocol, and the last 100 years of history have tended to make that claim seem true. So journalists and posters on forums do some of the job of expressing the counter-argument to Harry. They give the sort of fair criticism of a book, which all authors expect.
Harry appears to be driven by a mission. It used to be that he said his new book would one telling the story of the man he has become. Then he says it is his truth about growing up a Royal. And now, according to him, it has a bigger ambition, to reform the Royal Family, for its own good - and the country's and to end the abuse of 'spares'.
This sort of publishing event and the fact Harry left Britain, as he did, is newsworthy and comment- worthy. I do understand, though, that if you are not interested in the Royal Family, the comments might seem too much invested and too interested in things which aren't interesting. It must feel the same as it feels to some people during The World Cup: too much strong feeling and interest about something which doesn't matter.