Valid question.
First, “virtually every tainted elite athlete was black. IDK what your definition of elite is, but there have been plenty of very fast whites, very near 10-flat, who have been busted. Greece, Italy, and Hungary come to mind.
If you want to define elite by my arbitrary cutoff of 9.95, yes all busted elites have been black—but also, all non-busted elites except for CL are black. The point is that no white has ever before demonstrated the ability to be in the top-20 untainted, and so would be breaking new ground—a different situation than a black doing it, because there is precedent.
Of course if you believe that all blacks on the untainted list are actually tainted, then my argument has no merit...but it is then up to you to show that they are all tainted. I personally believe that many of them are actually tainted but that taint remains undiscovered—but I have decided to keep this thread within the realm of what is reasonably believable, if not definitive proof.
CL receives only normal scrutiny because he isn’t even 10-flat basic, not even the fastest basic white. At that, he is squeaky clean. Su Bingtian will receive increased scrutiny because his basic time is down there, and because he is from China. Like CC before him, Lyles will receive extra scrutiny because his raw time is so fast.
Also, every athlete who has gone wind-legal 9.80 or better has been tainted, and that therefore strongly suggests taint to me. CC is the latest member of that club—he was under suspicion because of his 9.79, which suspicion increased hugely with his indoor doper-crushing WR, and which was pushed way over the top with his history of missed tests.
Yes, this is all my judgment. All I have done is to eliminate some of the more obvious athletes from the all-time list. The list is therefore far from perfect, of course.