I don’t think harry is being hard faced to attend, I actually believe he genuinely loves his father and doesn’t wish to cut all ties. So wants to be there to support , at least briefly. I know Harry’s behaviour is appalling, but I think In this he’s going as he doesn’t wish to sever all ties with his dad. He’s not staying longer as it will be too hard for him now, too awkward. I think Charles would be very hurt if harry didn’t come at all.
as much as we can all look at harry and think how awful, in reality he’s Charles’s son, and whatever he does, like many parents, Charles will still love him deeply.
Everyone noticed that as much as Charles got a bit of venom served by Harry, he was let off very lightly, and what harry didn’t say was Charles and him were actually very close growing up , that’s why Charles didn’t get too much damage done and that’s why harry is coming for the ceremony. He loves his father. He’s just too stupid to understand that if he hurts those who Charles loves, and the monarchy, he hurts Charles.
my personal opinion is charles would like nothing more than his grandchildren to come too, just not to the ceremony due to age and lack of experience in that situation, unlike the other royal kids who have been doing it from birth, and I suspect he’s sad not to be going to see them.
there is clearly more going on in the back ground with harry and Meghan, she is never visibly supporting him any more, never at his side, when she used to be surgically attached, so I suspect there is more than we all know about going on.