Caster Semenya being unable to compete in 400m to mile events is wholly unethical and flawed. For context, Semenya is an accomplished female South African athlete who has higher testosterone levels than 'the average woman', and due to a new 2018 IAAF ruling on "differences of sex development", she's now barred from the aforementioned events. While her "having an unfair advantage" sounds simple on a surface-level, these implications and 'alms of testosterone' are widely overblown.
• The science is insufficient. The difference between testosterone and oestrogen performance is usually around 12%; Semenya is generally 2% faster than her competitors. While this 2% could be down to the hormonal imbalance, an athlete's psychology & work ethic & differing (eg more successful) training methods could all play into this. Semenya's BP has also been topped by others -- 10 years ago from Semenya's BP, in 2008, Pamela Jamilo ran 1:54.01, and even longer ago in 1983, Russian athlete Jarmila Kratochvílová (who has been vigorously tested and no signs of doping) ran the world record of 1:53.28
• Figures aside, many encourage Semenya to undergo surgery & take medicine to reduce her testosterone. Asking a woman -- a person -- to toy with their natural makeup just to prove one is 'woman enough' is irrefutably degrading and flirts with violating human rights.
• It singles out Semenya's situation specifically. Other women athletes that have higher testosterone levels, like congenital adrenal hyperplasia, are not asked to lessen their testosterone levels. Athletes who have increased red-blood cell mass, enabling heightened oxygen-carrying capacity, are not asked to fix their mutation. In fact, many athletes that have enhanced genetics with FAR more advantages than Semenya are and have been allowed to compete. For example, Finish skier Eero Mäntyranta's red-blood cell mass is up to 50% greater than the average person, thus, naturally, allowing a superhuman performance. He augmented this through natural doping (basically just gene therapy), which was allowed at the time and later outlawed, but his genetic mutation still remains just and fair.
Why then? Semenya is a black, androgynous, successful queer athlete. The amalgam of racism, misogyny, homophobia and transphobia that pervades the air -- and these faceless & massive institutions -- is omnipotent. It sends the message of "you're too male" to aspiring intersex individuals, and just reinforces the hopelessness and ostracisation millions of them go through. On most youtube videos featuring Semenya competing, the top comments are usually "the podium is filled with men", and the 3 white women who didn't make the podium are victims of these """men""" -- the other black athletes don't even have higher testosterone levels, they're just black and people can't handle their physique and athleticism, sadly. I could go on and on addressing people's faux-good-faith arguments regarding the "slippery slope of letting transgender athletes compete", but I don't want to derail and ramble further.