"And there it is. As I knew it would be. The number of transgender ideology advocates who want to disparage Blanchard is extraordinary."
What do you think of the idea that you propose a theory, test the theory and then claim that anyone who doesn't behave in way that supports your theory is a liar?
"And he has added ROGD to his analysis. Do you have any idea, any at all how many parents of children with ROGD are posting here? This is first hand experience."
ROGD is a conspiracy theory popular in transphobic circles. With the exception of occasional, tarns-obsessed outliers like Blanchard (read his Twitter timeline), no one in academia takes it seriously.
"Why would people have a different gender identity to their sex?"
No one knows exactly, but the consensus of scientific opinion now is that it is biological in origin:
www.endocrine.org/advocacy/position-statements/transgender-health
"The medical consensus in the late 20th century was that transgender and gender incongruent individuals suffered a mental health disorder termed “gender identity disorder.” Gender identity was considered malleable and subject to external influences. Today, however, this attitude is no longer considered valid. Considerable scientific evidence has emerged demonstrating a durable biological element underlying gender identity.1, 2 Individuals may make choices due to other factors in their lives, but there do not seem to be external forces that genuinely cause individuals to change gender identity."