I'll give my opinion. IMO, some of his films come off as adult fairy tales insofar as they have a "happy" ending.

Hitler and his henchmen die. War over. Mother and daughter ride off in their Karman Ghia into the sunset happily ever after. Fighter and his girlfriend ride motorcycle into the sunset happily ever after even up with Marcellus. The kind of resolutions and "happy" endings we want.

OUATIH is that happy ending to a horror story that killed the romantic notions of "The Summer of Love".

It ends at the Tate/Polanski gate, up the drive to a pleasant social gathering among neighbors. The Polanski child presumably is born, Sharon et al live all happily ever after. Is there a hint in the resolution that Polanski, occupied by a beautiful wife and child and a demanding career as a director, doesn't become a rapist and criminal recluse?

My friends and I were 15-17 when the murders occurred, chasing girls, playing sports in school and music gigs at night and on weekends. Everyone knew who Tate and Polanski were, seen their movies and had posters of Tate in our rooms and had begun drinking and experimenting with drugs. And really trying to adopt and adapt to the SoCal culture insofar as we understood it and could grove with it based on our ages, our parents, our coaches and zeitgeist of New Orleans in the mid to late 60's.

It's difficult to relate the shadow the murders cast over our whole scene. Tarantino has given us a happy ending in an alternate universe to a nightmare in ours. I get to leave the theater smiling and thinking...what if?

Despite his relatively young age compared to me, Tarantino has, IMO, tapped into that with his "fairy tale" approach to the subject, his deft handling of the SoCal vibe and scene, and the film's denouement.

That being said, It's been one of my favorite movies of all time though I know that's a very subjective opinion.

That's my take on answering your question.