This concern about....... identifying, isolating and exposing "trolls" mystifies me. If the are JWs and have the temerity to post here and endure whatever consequences ensue from his/her participation, then I say .. welcome!
It is the same on any message board or usenet group. Trolls are rapidly identified because to not do so has been found to be harmful to discussion. 1) discussions get unproductive because people argue about stupid things the troll brought up just for that purpose. 2) good contributors can get discouraged for investing time on troll threads that later turn out to be wasted; so they stop participating ..
In both cases the troll wins. That is why people are so quick (and in some case too quick) to spot a troll or fake poster..