Noted, Pom, thank you. Only, I don't think (and I'm not entirely sure you do, either) that making you angry means it's necessarily bad -- even for you, but especially for someone in a different place from you.

I've never been diagnosed with PTSD or BPD but I'd like to share a couple of (tangential, as usual) experiences here:

1. Years ago when "encounter" and other non-therapy groups were more common, I lived in an area where there were many such and used to go to them pretty regularly. Some I found "better" than others (and I guess "better" for me would've meant something like "more honest".)

A technique that people sometimes offered each other, and even set up groups especially for, was something whose name I've long forgotten, that was about putting someone (the victim, I jokingly called them, never aloud) up front or in the middle and having everyone take turns handing them warm fuzzies: telling the person what they liked or admired about them or saw as their best qualities. That was emphatically not what I wanted from a group, perhaps not ever but certainly not then. I envisioned myself (if I were ever to get a dose of that) half disbelieving it (they were only saying that because it was the assignment), half wondering how much mileage I'd get from it before it wore off and I had to go back for a recharge. In short, I didn't want comfort in hanging back from whatever battles I was having with myself or others; I wanted confrontation, of sorts, and the opportunity to get more adept at dealing with my own and others' stuff.

2. A few years after that series of experiences (and after a hiatus), I participated in a workshop where the workshop leader announced up front that (a.) he didn't care about us, i.e., didn't have an investment in whether we got better from the workshop or not; and that (b.) whatever he might say, we shouldn't "believe" it but just get that he'd said it, sit with it, and see what came up for us in response. Yes, it sounded thoroughly scary going in -- but also cool, neutral, and refreshingly honest, which happened to be exactly what I'd been looking for all along.

The rest of the workshop, which was quite long, always ran true to form. Parts of it I loved, parts of it I hated, parts of it I was afraid "weren't working" as I'd expected (or more likely, I wasn't "doing it right") -- but all of that turned out to be just part of the workshop, just more of my stuff coming up to be looked at, and it turned out that there really was plenty of room within their (our) ground rules to look at it all, talk about it, and let go of it. I'd say I got more out of that program (which, by the way, is no longer being offered) than out of any one thing I've done before or since.

That wasn't DBT, nor apparently much like DBT from what I've read, but it showed me very convincingly that the comfort level of an activity or program was not at all a good guide to its value for me.