I think what they will relate is that any type of questioning calls into question their very existence? And from there it questions (to them) any validity of their trauma, which caused the disorder?

I think also, and they will share maybe, that it's especially touchy when it comes from someone who is (or someone who is portraying to be new) to PC. Strangers scare their littles, sometimes cause their protectors to emerge, and thus cause more havoc within their system. (Let me know folks if I said anything wrong, ok?)

Perhaps it would be better to discuss this in the psychotherapy forum, or better yet, read the information on the links provided throughout their DD forum, and you will find the answers to even more than basic questions.

TC