I think Scientology is a laughable fabrication. But I also don’t see any of the prominent adherents proselytizing about it. I don’t see why we can’t leave them alone to worship whatever moonbeam myth they choose. Their sins are between them and their Maker, just as ours are.
The problem with the Scientologists is that they pursue people into the real world. A good example was Katie Holmes who was stalked by the Scientology creeps.
http://gawker.com/5922710/is-the-church-of-scientology-having-katie-holmes-followed
Scientology is a clear example of the gullibility of some Americans, which also plays out at the voting booth and in many other ways.