I was reading older posts and came across one that I wish I had found much earlier, when I first came to this site as a non-witness looking for information. The thread is here:
http://www.jehovahs-witness.net/watchtower/beliefs/26619/1/Why-do-Jehovahs-Witnesses-lie-to-recruits
Reborn 2002 used to conclude his posts with this:
It is not religious persecution for an informed person to expose publicly a certain religion as being false, thus allowing persons to see the difference between false religion and true religion.
WT 11/15/1963 page 688 paragraph 3
Beyond this being an excellent thing to post on a billboard, I think it has a direct relationship with the feeling shared by many, that billboards would make witnesses feel they are being persecuted.
Since I am not a witness, I see this billboard thing with different eyes. To be honest, I am more concerned with people NOT joining than with people leaving the cult. The reason is not so much that I don't care about those inside. The reason is, I realize that many will resist leaving tooth and nail. I think an information campaign would be more effective with those who don't yet have the blinders on. And I am thinking of the many countries where Internet access is not so widespread and English is not the language. Someone proselytizing could ask a non-witness not to check the internet, on the grounds that it's full of apostate material. Yes, it is, but apostate material is true. And these people could be prevented from checking the internet maybe, where they would find a lot less information in their native tongues than is available in English anyways, but they could not be prevented from reading a billboard.