It's a practical application of reductio ad absurdum, following a proposition to its logical extreme to test its validity.
If there was not one single example of any artificial deviation from an Olympic competitor being a competitive advantage, the argument would be moot.
As R5 #1,296 suggests, the Pistorius case may be such an example, though it does not necessarily bear directly on the trans issue.
It may help settle rivalries, solidify resentments among contestants.
NASCAR was reportedly born of Prohibition, the Constitution's 18th Amendment.
The idea was to have an automobile fast enough to deliver moonshine from distillery to customer, with the ability to outrun the "revenuers", government agents enforcing Prohibition law.
But drunken rednecks arm-wrestling at the neighborhood bar is different from nation States participating in international competition.
This can happen when winning becomes a higher priority than the competition itself, an explanation for why 12 year old Soviet gymnasts had to shave their beards before competition.
You've reminded me of Kevin Costner's Waterworld.
You may be right R5. I suspect it's more likely to be the more obvious braggadocio of the self-impressed, not content merely to believe themselves superior, but to demonstrate it.
And those "12 year old Soviet gymnasts had to shave their beards before competition" are the females.

