This is a lot of words for what most people know already-you have to be disturbed mentally and emotionally to mutilate yourself with a sex change.
I think it actually says a fair bit more than that. It says that most GID suffers know and recognize the psychological trauma that contributed to their solution and that in a supportive environment that can help them address that underlying issue there is hope for more wholeness in their natural gender and less pain in their life going forward. Finally, it says that some well-meaning parental responses intended to convey their acceptance for whomever the GID sufferer may be, particularly in pre-adult years, can be harmful by pushing them further from the needed insight and understanding.