This is merely step one wrote:
No one has ever stated or implied that Caster Semenya has been a PED cheat. Caster Semenya is more women than man naturally. Caster Semenya is equal to an above average 17 year old male, world wide. [Please do not tell me that Semenya's personal bests are faster than your high school male records.] Semenya, it has been discovered has a natural genetic advantage.
Ethiopians, those from highlands in Nepal and South American highlanders have genetic structures which makes them resistant to chronic altitude sickness. It won't take long before it is discovered that said highlanders have naturally higher VO2 &/or naturally greater ability to perform at a high level while anaerobic. How long until IAAF ban Ethiopians, 3000m to Marathon due to an unfair genetic advantage?
Is David Epstein and his Sports Gene book going to get Kenyan 800m runners from Rift Valley banned from events 800m to 3000m due to an unfair inseam to height ratio? Is David Epstein and his Sports Gene book going to get those with over 25% recent (within 500 years) west African DNA banned from 100m to 400m?
Do those with Phoenician DNA, modern Algerians, Tunisians and Moroccans have genetic advantages in 1500m?
This Semenya case is going to set legal precedent. Do IAAF not know the legal precedent they are setting? Maybe IAAF has less than benign large plans.
A slippery slope arguments are usually pretty silly. The argument above is no exception.
Sport is many things, but its raison d'être is the telling of human interest stories. An intersex athlete dominating sport is, indeed, interesting, but one suspects that (a) it is not as interesting to most people, except as a novelty (and it is probably past that point), and (b) it may set up a situation where intersex athletes dominate the female division, which is not a compelling human interest story at all.
However, so far, I don't see many intersex athletes dominating female sport, so until the empirical evidence says otherwise, maybe we should just not interfere. Still, the integrity of sport, and especially female sport, does seem a bit compromised by allowing people with some form of testes to compete against other women. However, everything about professional sport is a bit compromised. That's what happens when there's a lot of money to be made.
The last Women’s Olympic 800m first 3 finishers had Y chromosomes!
The IAAF has now generously set the testosterone level 7.5 times higher than any female athlete with XX chromosomes has ever produced naturally, and two of the medalists in that women’s 800m Olympic final are complaining that they would have to lower their testosterone to complete!
I think you need to develop a very absent sense of perspective.