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 Science of Survival.
Although every person is basically good, many people don't act that way; many people are, in fact, working more towards the destruction of themselves and those around them. They can do this in overt and covert ways. Too many people get reasonable with these types of people and explain it all away. I don't. Also using the data in this book, I am able to spot these types of people, and this makes my life less endangered by this type of person