The problem is, the royals entire existence - everything they know, everything they were brought up with, everything their parents knew, going way way back, has relied on people loving them and believing in them. That's their whole thing. There are 100s of people working on just that - their image, and making sure enough people like them to survive.
Sometimes those people working around them decide that there needs to be a sacrifice and it's usually a woman who is high-ranking enough for people to care about her, but low-ranking enough for it not to really matter what happens to her. So it could never be Diana, the people had to love Diana, but it could be Sarah, as the wife of the second son, she was the perfect scapegoat, so the press vilified her and begged up Diana. Are we seeing a pattern here?
Trouble is, Prince Charles, as was, was obsessed with Camilla and needed her so desperatly as a lover and a mother figure to him, he clung to her and refused to let go and it caused a huge problem because they had bigged up Diana so much that everyone adored her to almost reverent proportions and when she died, she practically became a saint. So now they had a partner/wife of a future King that noone was going to love and adore as much as they needed to and the plan they had with Diana had gone to absolute shit.
They needed a SERIOUS scapegoat to take the heat of Camilla and also make Kate look good, ready for when she took over. Not just a bit of deflection like with Sarah and Diana, but they needed someone for the public to absolutely despise before they could ever make people accept Camilla at all, never mind like her.
This was always going to be the wife of the second son, just like before, so Harry's wife. No matter who she was. If it had been Chelsy, it would have been her. But it was Meghan and her being mixed race and American just made it all so easy for them.
Then Harry, as I said, made an understandable mistake by whisking her away from it all, and made it all even easier for them.
Noone cares about the evil marriage stealing "other woman" Camilla any more. Meghan is much more easier and fun to hate and the press had all the highly experienced and intelligent, gaslighted spin doctors working with them will continue to play on that. It will never let up.
And Harry really doesn't know how to manage it, and has no one to help him. He acts on his heart and doesn't think like the manipulators around him. He can't out maneuvered them. He'll never win and he knows it. I honestly feel so sorry for him, he never stood a chance, no matter how much good he did in the army, with invictus games, how much he was adored before as a cheeky chappie, he had a role to play to ensure survival of more important people and they were going to make damn sure he played it, even kicking and screaming.
It's toxic, it's unhealthy, its dangerous, it's cruel but here's the second problem - every single one of them beleives with all their hearts that the monarchy will and should last forever and ever and they have absolutely no back up plan. No alternative. It's this or nothing. Even if they don't want it or like it, it's their destiny and their lot and it's all they have. So it will go on and on and on until the modern day Robspiere appears and puts a stop to it, I guess.