Remember a few years ago they started banging on (fnaaar, fnaaar) about porn and what kind of porn was "judicial" and what type wasn't but needed counsel?
So now MS/Elder brother "guilty conscience" comes (fnaar, fnaar) forward and confesses to wanking to porn. (Of course for every one that does another ten wank to porn and keep it between them and Jee-ho-vah)
Whole body now "need to know" he has a problem. What he's been wanking to? And how often? Let's assign two brothers to find out more. Even if it's low grade he may well get removed; if it's deemed judicial he'll will definitely get removed and even worse if it's kiddie porn they'll be on the blower to bethel to find out if they need to report him to the authorities. (which of course they should.)
So more and more peoples porn habits get known to the body of elders. They all realise that they aren't the only ones with "this problem" and they spend too much time thinking about it.
And if you think about it ....
The grapevine tells me that in my own hall at least one MS and one Elder have been deleted (at least in part) for this since the letter came out.