What makes me furious with all this speculation about Diana’s death is all responsibility leads back to Fayed himself. IMHO.
It was his lack of security for his son and Diana, his driver (drunk or otherwise), his promotion of ideas they were engaged and/or pregnant (despite his son having another fiancé on another boat previously which created unnecessary post death speculation, it was his hotel they ate at - they could have stayed there that night, and it was his son orchestrating their date night. More than likely Fayed had been pumping up the pressure the romance to create the press hysteria.
So if Harry wants to blame someone start focusing on Fayed. His invitation to holiday. His boat. His son. His security. His car. His driver. His restaurant/hotel. His idea to push the romance/fling.
So, given Hazza’s chronic emotional insecurity, low cognitive grist & all-round ire, he is so dumbly oppositional that he could be swayed or courted by the Al-Fayed mythologising.
He’s a seeker for something or other, like Peter Pan & the Lost Boys.
He’s gone way past his natural mourning for his mother, round the block & into the long grass of obsessive mithering, & as we can see Smegz has tapped into that deep pool of vulnerability, delusion, obdurate oppositional vengeance.
Smeg both mothers & mithers him, win-win for her as she catches him on both the up & down of his inner turbulence or cycling moods.
Thing is he never grew up with Diana as his mother in the fullest sense, she was gone before she could correct his worst tendencies & enhance his strengths, she was not there to read him the full-on Riot Act when he played up badly as a teen & to support him with unconditional love & support when he got it right. William was that bit older so had more of her nurturing, that bit (much) more intelligent & got away to a school that suited him in good enough time to develop the natural mother-son separation & burst of independence. Basically William had done puberty by the time Diana had died, whereas Hazza was about to crash that tape.
Hazza really is stuck as that 12 year old boy - the Peter Pan Prince.