Steve2, I haven't kept track of any back-and-forth here, but I was thinking your accusation was over-the-top. They share a computer and [he] put a few files there to help his b-i-l. He's able to keep track of the fact that someone takes access to those files. It's not hard for his b-i-l to realize where the files come from and you don't know more than that, yet you say "There's something more than a little unethical about your thread" and go on to say he's using "skillful dishonesty."
Even if it were "skillful dishonesty," (which I would argue against) it is not your call to say it's unethical.
If I were to hire Steve Hassan or some cult-exit therapist to sit next to my wife on an 8-hour flight and use some "insider information" about her, in order to help her use her own mind to think for herself, I don't give a crap that someone like you would call that unethical and I would also take offense strongly to any such suggestions.
If he were leaving pornography on the desktop of a minor, and keeping track of the minor accessing it, okay then. But otherwise, I cannot see Steve2's point here at all. The man is free to address the leaving of files openly, delete the files, ignore the files, or read the files. They are not pornography left for a child. They are propaganda, true. But hurray for their existence.
I have no problem with one person here feeling that every JW has the right to be a JW without "interference" from others. I also have no problem with someone else (like me) feeling that JW's are in a dangerous mind-control cult and need a bit of help from someone willing to use what you call "skillful dishonesty." It ain't my place to try to call them out in their situation with my ethics layed over their own ethics.