A thought, for what it's worth:
There's an understanding in social psychology that, when a group feels threatened or attacked by outsiders, that fear pushes them deeper in. To JWs, seeing public attacks against them fulfills End Times prophecy, which in turn makes the JW platform seem more credible. They were told this would happen, and -- hey, look, it is! The GB must be right!
If you look at some more dramatic examples -- Jonestown, Branch Davidians, FLDS, and so on -- it's all of that criticism over time that makes the groups stronger and more isolated. It's a great tactic for keeping people in.
So if the goal is to get active JWs to reconsider, is it more likely that it will backfire? And if the goal is to educate others, is it worth the risks? Those are some questions to ask.