I remember the funeral and the bouquet with the envelope. I'm around William's age group and had lost my dad suddenly at around Harry's age so the event emotionally resonated with me quite strongly.
Grief isn't top trumps, but to so suddenly, in particularly traumatic circumstances to lose a parent and to have your grief so public and your lost parent constantly in the public eye is a particularly difficult combination of circumstances. Wealth and privilage don't buffer everything.
If he'd left the royal family to live a low-key, private life, that would have been understandable, but he hasn't. He's very publicly aired his criticism of them on several occasions since then and simply comes over as a hypocritical, untrustworthy idiot.
Whatever the rights and wrongs of whatever various royals have done, I wouldn't trust Harry to make a truce and not splurge the relationship all over the media in the future.
I can feel sympathy for his experiences as a child but still think he's a petty, vengeful, spoilt adult that has little concept of reality beyond himself.