I would never return to the truth. Did you ever see the movie with Jim Carey, (shoot I forget the name of it). But he lives in this perfect little world, and he is actually livnig on a TV show, and has been all his life, but doesn't know it. So everyone hides it from him, and one day, he starts to suspect. so he sails off into the "ocean" and finally sees this actual ladder against the "horizon", and realizes that the "sky" is just part of the TV set. He tears through the wall, and is free. (Please tell me you've see this movie, or I won't make any sense at all).
So to me that's like the JWs. I KNOW it is all false. I would never go back because I am 100% sure that it is false, like a big fairy tale.
A simpler illustration: Why would a kid go BACK to beleiving in Santa Claus, after he's already found out the real story after seeing his parents wrapping the presents? He KNOWS that he's been fooled. Now he's grown and KNOWS the real story.
Got it? Am I making any sense to you? Good luck in understanding your brother.