No doubt the version of how to explain their absence to the children when they are older has already been carefully thought out, and I'm sure it will be made very clear to them that their parents weren't to blame, it was everyone else's fault instead.
No one knows what is going on in their head. That is some heavy fantasy/fan-fic writing.
I'd call it common sense.
They're hardly going to tell the children their own actions caused the estrangement, unless they experience some sort of miraculous epithany, seriously reflect on what they have done and acknowledge their bad behaviour. That's unlikely to happen (and that's an understatement!), especially not while their perceived grievances give them a chance to earn money. It doesn't take Einstein to work that one out.
How many copies of Harry's book would have been sold if it had been called something less provocative and contained both the good and the bad, but written in a fair, balanced and non-judgmental way?
Without the whinging, the betrayals of privacy, the spite, the nasty nicknames, the clear cases of too much information (the Elizabeth Arden business, the first time behind the pub stuff?) and all the rest of it?
If the trailer for Oprah's interview had shown Meghan saying: "Well, y'know, things didn't quite work out but we want to put it behind us now and I'm going to tell you all about Archewell instead" How many people would have tuned in?
Without all those unsubstantiated allegations littered with inaccuracies?
And I won't even get started on the Netflix Series!
No one needs to see what's going on in their heads,
because they've committed it on to the printed and digital page, and on to video tape, for the world to see for all time. (Harry even narrated the audiobook himself, so he can't wriggle out of that one either)
One day their children will grow up and read and see it all for themselves - if they're lucky and don't get constantly told about it beforehand, as they get older and inevitably mix with other people. What they will make of it all I can't even begin to imagine.