You're belief system is based on our typical American lifestyle. I'm sure Charles had no capacity to help this woman, it was so out of his realm of knowledge. They were too far apart in age and life experience. He offered her a lifestyle which included everything you could possibly want...except love. That's the interesting part. Many women would have made the best of her situation. She was not mature enough to do that. What I don't like is how she brought everyone down with her, that was the most immature thing, IMHO. And don't for one minute think that her dalliance with Dodi Fayed wasn't still a ploy to get back at the Royal family. But it backfired on her, didn't it?
That's no excuse. He seemed pretty well read up on architecture.
I don't like your "he offered her a lifestyle". Who wants a lifestyle where your husband loves someone else but is stuck with you?
Maybe he's the one who should have made the best of the situation.
Your lack of compassion is chilling. Backfired on her? It did that.
Maybe there will be more backfiring down the line.