The value in these types of shows is they open the eyes of the general public to the fact that these religions are not as benign or harmless as they might think are and to give a voice to the individuals and families who have been burned by them.
They serve as a warning to the public rather than a wake up call to members. If they turn the heat up and the spotlight on the harmful practices of the group it's served purpose ie warning the avergage punter to steer clear and also alerts people like teachers, drs, lawyers, counselors who have to deal with JWs. If activism is only ever directed towards the indoctrinated themselves we 'll never get anywhere.