Scientology tends to attract derision and mockery rather than investigation, which is unfortunate. Apart from anything else, its belief system involving evil aliens, volcanoes and DC-8s is no more bizarre than most monotheistic religions.

What Scientologists believe is irrelevant and not the business of the state or, really, anyone else.  It is what they do that is of concern -- what they do to those who refuse to comply with the cult's internal rules, and what they do to those who reveal the abuse that goes on within the cult.