The big change in viewpoint on this came in the late 90s.
Ron Hubbard Fathered Scientology. He provided the Sperm for its ultimate development.
The big change in viewpoint that came in the late 90's was laid at the moment of scientologys conception.
Given the overwhelming amount of documented evidence (available for view) the belief that somehow or other David Miscaviage ruined L. Ron Hubbards 'religion' of scientology is evidence of the susceptability to delusion that Ron Hubbard lived for and preyed on. Which David Miscaviage merely brought into worldy puberty.