"New people who are damaged show up here and their capacity to tolerate less-than-diplomatic handling is a disservice to their condition.... I think we could all be a bit more tender with the Newbies, if for no other reason, than because this is Triage. Only a few will make it through the tunnel to daylight anyway."
I don't disagree with that, and what you depict above is not what I was responding to. I was responding to "must" in your sentence saying "If you wish to be persuasive, you must be diplomatic." As I said before, I don't think that's always true (emphasis on "always"). I do not suggest what you say is never true (emphasis on never).
There are lots of folks who need tender handling for all sorts of quite valid and understandable reasons. You articulate an example of that in the many JWs who happen upon this forum looking for help with what's ailing them. As you did above, with my early comments I too offered an example of what I was speaking of. Based on what you write above, I don't think you and I disagree.