The 1st Amendment gets rite in your way here,There are groups with way more wacky idears the the WTS that operate with the full protection of the 1st IE the "Man boy love assoation"The "KKK" "White supremacy" groups the list goes on and on.
What your asking a court to rule is "Were does the 1st amendment run out"??
In my opinion it dosen't run out as far a shunning goes,Many groups like the "Free masons" and other religous groups have the same rules as the J.W's
The J.w's woul'd argue (and they are rite in IMHO) that you were read the rule book before you became one so you knew what you were getting into.
Karter.