The above are peer reviewed and published data and expert findings
of fact the below is my summary of them:
Multiple independent studies have demonstrated a high probability that mutations to the Androgen Receptor (AR) and estrogen receptor genes ERβ \cite{Fernandez2018} \cite{2019NatSR...920099T} These genetic differences correspond to various differences in brain strucutre such that sexually dimorphic brain structures of transwomen match those of ciswomen, and those of transmen match those of cismen. \cite{Boucher} The differences are also mannifested in the form of reduced fertility and general undermasculinization even prior to any hormone treatment. \cite{Amir2022} The above finding is backed by MULTIPLE independent expert, peer reviewed, published meta analysis, a study of all available studies. \cite{DAndrea2020} Crucially for the issue of fairness in sports there are relevant endocrinological differences. \cite{endocsoc} A study done on post pubescent transgender adults by \cite{Hiltona} concluded a large advantage for transgender women in every sport, however, this article was corrected by the journal due to their undisclosed confict of interest. \cite{Hilton} A further study, also cited by Hilton as being well done, found after 1-2 years on hormones little to no difference in strength but a 5% advantage in speed for transwomen. \cite{Roberts577} Based on \cite{Roberts577} the British Journal of Sports Medicine concluded that given the data on competitors who are transitioning as young adults at the elite and collegiate levels there can be a difference that confers advantage, at the same time at the high school, youth and recreational levels when all the data is considered there is not necessarily an advantage. \cite{BJSM}
In the opinion of a trans researcher on the team who worked on \cite{Roberts577} which was cited by the British Journal of Sports medicine, \cite{BJSM}, the issue of sports is nuanced with advantage in speed but not necessarily in strength over time. \cite{webb}
The Policy opinion of the Libertarian Party of the United States of America, hardly a left wing party"Attacks on Trans people are an attack on Liberty" that fear, lies, and sensational stories are being used to justify taking rights from a easily villified minority, and reduce the rights of the majority in the process." \cite{Libertarian}
According to one Sports Mangement law review, something which the author of the current document admits is not in her area of expertise the current public laws of the United States lean towards inclusivity. \cite{Buz}
Given the scientific facts as confirmed by multiple studies and taking the biologically essentialist framework as a given we can answer the key questions.
Do transgender people have the choice of completely conforming to gender norms and just being manly men or feminine women? Does the available data show that transgender people exist due to genetic, hormonal, neurological and or any other physical and immutable cause?