Walt did make a PG rated movie, Treasure Island, that was cut down in it's 1975 re-issue to remove violence that had originally been in it. he had always been criticized about the amount of scares and violence in his animated films as well.Rudy Matt wrote:I don't know what Walt biographies you've read, but its perfectly clear that Walt was alarmed and upset about the ever increasing sex and violence in films of the 60's -- do you know why Dick Van Dyke captured Walt's attention? Not his stellar work on Broadway or his TV show -- it was an interview he gave decrying the very same sex and violence and content that had upset Walt.
Over the top, realistic Bonnie-and-Clyde like violence may have been the thing Walt was against (in addition to explicit sex) but violence in general was not something he was totally against if he felt it was appropriate for the story (and I don't need a biography to tell me that, I just watch his movies!).
Audiences change over time and PG in America today is the new G, with PG-13 the new PG. Audiences learned to accept the idea of PG rated Disney films in the 90s (The Rocketeer, Newsies, Hocus Pocus, White Fang etc) and I'm sure Walt would have changed with the times, perhaps being upset with the shift of values in the 70s (or movies like Bad News Bears which show kids swearing like crazy) but he would have accepted some shifts in values if he felt the basic morals that made his movies good were still there. He wouldn't have just sat and made outdated irrelevant fluff like most of what Disney actually made in the 70s, he would have pushed technology and done everything he had done before, just in a newer decade.