I think his desperation to blame someone for his mums final abandonment comes from him not wanting to face the truth that his mum was happy as larry not being with him all the time.
ALL little boys struggle when their mum starts focusing on men who aren't them or their dad and she was doing a fair bit of that (this is not slut shaming she had every right to be dating) for a lil boy who had always been spoilt and unwittingly involved in a weird dependency situation by her, it must have been hard to accept that he wasn't enough to keep her happy. She has to take some blame for that because by all accounts she had convinced the kids they were her only happiness which wasn't realistic fair or true.
The last year or two she was desperately looking for happiness that her sons couldn't give her because she was an adult, it's sad that she had led the boys to believe they could satisfy that need in her but it's nothing to do with the press, the public or the royals.
I admire Diana for the AIDS and landmine work that she did but as a mum she was tit. I've always felt that.