I want to chime in here with a few things...
1. We can't really comment on why a member left, or chose to leave -- that would violate the member's privacy. That's why we have the guideline about not speaking for other members or other people -- they can speak for themselves if they'd like. Without this information, you can't say how 'gently' or not a member was treated by the support team here. But I can assure you that we often bend over backward to help members bring their behavior in line with the community guidelines. Remember, we've been doing this for 13 years here -- this isn't some website community started last year. (So yeah, we may have some idea of what works and what doesn't...)
2. We have a "No leaving posts" policy for good reason. Some people -- too many -- have abused this as a way of getting attention, and then 'changing their mind.' That's fine, no judgment, but it was creating too much drama.
3. We don't post every time a thread is removed, because that would be against the "discussing admin actions." We do allow for occasional discussions (such as this one), where we can clarify the guidelines or our actions. Why don't we allow the discussion of admin actions? Because our community is a self-help community, not a place to discuss the minutiae of how we moderate the community. You're welcomed to PM me with any concerns you may have about this -- or any -- administrative issue.
Best,
DocJohn