I think the letters are good for people who might be considering doing the same. Also good for many PIMO people not to feel isolated.
That's the frustrating part, knowing that you can talk til you're blue in the face, but it will likely only be met by a pair of glazed eyes.
Just because we don't see some kind of Eureka moment, doesn't mean that it has no effect. It's a cult, people are brainwashed, are biased and influenced, and convinced that anything outside is an attack. But they are still human beings. They read, think and question (even if they themselves don't even notice).