I've seen these things happen, and I believe it's a lot more obvious to the rest of the congregation than you think it is. Basically it went something like:
1. Someone in a leadership/serving position told a counselor about a sin in private, looking for some help, direction, or advise.
2. Counselor really doesn't do anything helpful at all except maybe abruptly state the obvious, but they do immediately make the person step down.
3. People notice, immediately, and it doesn't take a genius to figure out that something bad enough was done that they were asked to step down.
4. The gossip engine kicks in. Sooner or later somebody somewhere will spill something, then it gets around rather quickly.
5. The end result is that the entire church knows "something", who knows exactly how accurate it is, but it's "something". The original something that was shared in private should have been kept completely private and this person should have been helped in a meaningful way. Publicly and immediately making people step down isn't exactly the most effective way to do that. It is however and effective way to start the ball rolling in terms of them leaving the church though.