The keywords here is that "you have the right to go to the authorities". For sure you do, but that does not mean it won't have consequences for you within the cong. Just like you have the legal right to choose your own medical treatment. What happens after you make that choice is a different story. This is very much the same legalistic approach put forth by the org when asked about shunning policies. Shunning is not an official policy of the WTBTS. The answer is correct, but the question is preemptively stripped of its meaning.
The society will report to authorities where required, that is, once they have confirmed the event thru the two witness rule. Before that, they are not obligated to comply. Member do have ther right to report, that is their constitutional right. But under the light of WTBTS the member will be prosecuted for denouncing something that was not confirmed following WTBTS regulations.
Its all legalism. Put together to avoid more lawsuits and bad publicity.