Wade needs to demonstrate he has changed because wade himself claims he has changed.
He claims he has found a more successful manner of interacting and being, and wants to share that with others.
He arrives at an exmormon site and declares his wish to help these people deal more productively with their pain. When his long, and usually nasty, history raises its ugly little head (as it always will, Wade has established too long of a history to ignore), he explains that he has altered his past behavior, found a more productive manner of viewing the world and interacting with it, and out of his benevolence, wants to share it. So when he demonstrates behavior that clearly, clearly demonstrate he hasn't changed at all, he dooms himself. No one else does it to him. It's not being outnumbered. It's being wade.
Runtu said it best:
That's exactly the problem. Wade isn't there to dialogue. He's there to invalidate the negative feelings people have about the LDS church. If you don't see that, you haven't been around Wade much.
I would say that whyme probably does see that - but since he agrees with it, doesn't have a problem with this goal.