With deference to those posters who have lost a child, I know from my husband who lost a son a while ago, that loss brings with it heightened sense of emotion, often lying dormant and under control, but sometimes out of the blue it can be triggered when least expected. It's the nature of bereavement. When Harry was a child his mother was clearly everything to him that comes across and whilst he won't be the only young person in the world to have lost a much loved parent, his personal tragedy is dredged up constantly, he was only a kid at the time, and it's clearly something he has to carry around with him. Possibly becoming a father has overwhelmed him emotionally, insomuch as love can be very much tied up with loss, I expect he's had his moments of reflection where he wished his mother was still here to share his experience of parenthood with him. Just a thought, I'm no psychiatrist.
Unfortunately the milieu Harry and Meghan seem to immerse themselves in, and of course with her acting background Meghan brought some of her own baggage. That combined with an increasing stance associated with a strata of the very privileged, most of whom have a disconnect with how ordinary people live. Grandstanding on certain issues and self congratulatory lecturing, planting trees and the like, does tend to piss the prolls off, someone should tell them, perhaps they do, they've certainly offloaded a lot of staff along the way!