If you want to find out more about Dianetics and Scientology, the best way to do this is to read an L. Ron Hubbard book on the subject. I personally recommend you read Dianetics: The Modern Science of Mental Health.
This book really helped me with understanding why people would do some of the senseless things that they do. It explains why people would get emotional for no reason and an instant later be totally angry or depressed or cry or act like there was no answer for something. In this book, it tells you how to handle the cause of this.