Besides ignoring the concept of gender identity, the opinion piece fails at taking into account aberrations caused by chemicals and/or drugs during fetal development.
QuoteDespite extremely tenuous scientific assertions that hypothalamic size variations and other factors might be associated with transsexualism, there is in fact no scientific basis to suggest any biological causal factors for this condition.
Guess MRI scan information means nothing

QuotePsychiatry's obsession with classification and diagnosis has thus allowed for an inappropriate recognition of this specific over-valued belief system, transforming it into an actual definable medical disorder.
The ICD has coding for financial, housing, and employment issues, not exactly the first thing you think of when asked to name a physical or psychological health issue
http://apps.who.int/classifications/apps/icd/icd10online/?gz55.htm+z56QuoteAre we using our professional attributes with true compassion, wisdom and skill for our most needy and vulnerable patients? What exactly are we endorsing when we medically legitimise GID and who are we destroying?
The current best known "cure" to issues of gender identity and body are hormonal and physical treatment, granted neither will on its own solve any issues that the patient has concurrently. But for the most part, people who have successfully went through treatment are more happy and healthy, and shouldn't that be the point of medicine?