I too was once involved in Scientology and like you believe the early motives and acts of this organization were in some ways good. I too believe that those within became greedy and saw this as an opportunity to feather their own nests and this led to its corruption as well as the need for conformity within its structure (fear). This too could be said of Christianity and almost any other charitable movement you could mention.
Everything is like the Curates Egg - good in parts, bad in others.