A group of people talking about sadomasochistic acts with underage children do not have a reasonable expectation of privacy. The particular wiretapping statute in use in Massachusetts is the exception, not the rule in the United States; in most jurisdictions, one is entitled to record any conversation in which one is a participant. So to claim it's a 'right' is specious.
As for the argument that if you don't obey the law, it's anarchy, do you advocate celibacy for homosexuals in the many states in which sodomy is still a crime? If not, you're a hypocrite.