Well said, Phizzy.
There are "Voluntary associations", and there are "Voluntary associations". Extricating oneself from a high-control group such as the Jehovahs Witnesses is not nearly as straight forward a process as it may first seem to be (particularly to those whose understanding of such matters is of a more superficial nature).
Sadly, too, you are quite correct about the number of suicides which result from their cruel policy of shunning. Sad as it is, it shouldn't be any great surprise, and is also seen amongst other high-control groups who similarly practice shunning (such as the Exclusive Brethren). Each one of those persons who thus commits suicide is just as dead as anybody who in previous centuries was burned at the stake or stoned to death.
Religious freedom is not absolute. That is the only reason why heretics are no longer burned at the stake for infringement of "theocratic" rules.