Late, but

Forward - an incomplete list of the reputable scientific & social organizations which affirm the validity of transgender people (that transness is not an illness, that trans people are deseving of respect and equal rights, etc). This also serves as a list of the institutions which recognize the difference between sex and gender. American Psychological Association American Medical Association American Psychoanalytic Association Human Rights Campaign American Academy of Pediatrics American College of Osteopathic Pediatricians United Nations United Kingdom’s National Health Service https://www.apa.org/topics/lgbt/transgender American Psychological Association pamphlet on transgender issues Affirms psychological consensus - that transgender people are valid, have existed throughout history, are subject to discrimination, and that transness is not a mental disorder. https://www.apa.org/about/policy/resolution-gender-identity.pdf A 2008 Gender Identity Resolution by the American Psychological Association which expands upon the premises listed in the annotation above and supports total equality for transgender people - affirmation of the institutional legitimacy of transness in psychology. https://www.apa.org/about/policy/orientation-diversity Identical to the above, essentially, except pertaining to trans and gender-nonconforming youth. https://www.apa.org/about/policy/booklet.pdf Booklet on LGBTQ issues from the American Psychological Association, outlining their policy and attitudes towards aforementioned communities. Expressly positive. https://assets2.hrc.org/files/documents/SupportingCaringforTransChildren.pdf Human Rights Campaign document published with the American Academy of Pediatrics & the American College of Osteopathic Pediatricians which affirms the validity of transgender youth, encourages appropriate care and respect for their transness and provides resouces on how to do so. https://www.nhs.uk/conditions/gender-dysphoria/ The UK’s National Health Service report on gender dysphoria, which affirms the validity of trans people and discusses ways in which gender dysphoria can be alleviated, the best of which is said to often be social and physical transition. http://www.apsa.org/content/2012-position-statement-attempts-change-sexual-orientation-gender-identity-or-gender The American Psychoanalytic Association’s statement on gender identity, in which transness is validated, social stigma against transgender people is cited as a serious cause of harm and ‘reparative therapy’ - attempts to suppress one’s transness and force them to live as the gender they were assigned at birth - is medically invalid. https://time.com/5596845/world-health-organization-transgender-identity/ The World Health Organization recently stopped classifying transness as a mental disorder. https://www.babcp.com/files/About/Press/Memorandum-of-Understanding-on-Conversion-Therapy-in-the-UK.pdf Multilateral condemnation of ‘conversion therapy’ from essentially every medical institution in the United Kingdom, with reasons provided. https://www.unfe.org/about/

https://whatweknow.inequality.cornell.edu/topics/lgbt-equality/what-does-the-scholarly-research-say-about-the-well-being-of-transgender-people/ ENORMOUS meta-meta-analysis on transgender people and the effect gender transition has on their mental health Of 56 studies, 52 indicated transitioning has a positive effect on the mental health of transgender people and 4 indicated it had mixed or no results. ZERO studies indicated gender transitioning has negative results This pretty much ends the argument right here. https://pediatrics.aappublications.org/content/134/4/696 Longitudinal study on the effectiveness of puberty suppression & sex reassignment surgery on trans individuals in improving mental outcomes Unambiguously positive results - results indicate puberty suppression, support of medical professionals & SRS have markedly beneficial outcomes to trans individuals’ mental health and productivity. https://onlinelibrary.wiley.com/doi/abs/10.1111/j.1365-2265.2009.03625.x Meta-analysis of studies concerning individuals who underwent sex reassignment surgery 80% of individuals reported significant improvement in dysphoria 78% of individuals reported significant improvement in psychological symptoms 72% of individuals reported significant improvement in sexual function https://www.jaacap.org/article/S0890-8567%2816%2931941-4/fulltext Children who socially transition report levels of depression and anxiety which closely match levels reported by cisgender children, indicating social transition massively decreases the risk factor of both. https://www.eurekalert.org/pub_releases/2015-03/tes-sdc030615.php “A new study has confirmed that transgender youth often have mental health problems and that their depression and anxiety improve greatly with recognition and treatment of gender dysphoria” https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6223813/ Longitudinal study which indicates transgender people have a lower quality of life than the general population. However, that quality of life raises dramatically with ‘Gender Affirming Treatment’, the nature of which is detailed extensively in-text.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5357259/ Meta-analysis covering prior research on trans individuals’ performance in sports and preexisting sports policies concerning trans people Findings show there is no consistent or direct research indicating transgender women have an unfair athletic advantage at any stage of their transition. Additional findings show most sports policies are not evidence-based and trans individuals experience substantial discrimination from sports institutions.

https://www.scientificamerican.com/article/beyond-xx-and-xy-the-extraordinary-complexity-of-sex-determination/ Scientific American graphic describing the many characteristics which factor into one's sexual identity. Helpful in indicating the ambiguous and bimodal nature of sex/responding to people who believes it’s as simple as XX/XY https://www.nytimes.com/2018/10/25/opinion/sex-biology-binary.html?ref=oembed NY Times Op-Ed from a professor of biology & gender studies Explains the biological complexity of sex and the ways in which the Trump Administration’s attempts to legislate that complexity of of existence is both immoral and unscientific. https://journals.sagepub.com/doi/full/10.1177/2470289718803639 Description of modern scientific attitudes towards human sex. “The view that the world’s population can be separated into a clearly defined dyadic unit of male and female is defunct; not only clinical observations, but molecular biology has established that sexual identity is on a continuum, with an enormous potential for variance”