Truth is not about making your own Truth and all sorts of othere allegations. Truth only is truth when it is proven. "I think" or "I believe" have no place in Truth.
Naive is denying that dope exists, I don't. But it is also naive to think that a certain athelete is clean and another is doped when there is no single piece of evidence on both of them.
If you can't deal with the fact that you won't have any certainty on whether an athlete is doped or not, it would seem to me you'd be unable to enjoy the sport except perhaps in an own created imaginary world of "clean" and "doped" athletes, mostly driven by the color or nationality of the athletes in question. If you're comfortable with that, (and I know lots of people who do), fine, I can respect that. But it also means that your opinions do not carry any value outside of that self created reality.
The fact is that there are only two types of atheletes: 1. Ones who where proven to be doped and 2. of we do not know whether they are doped.
There might be athletes who missed dope controls or there is other substancial evidence (e.g. having relations to medical doctors who have been proven to have relations with doping), they might fall in a seperate category. In any case this is not applicable here.
Innocent until proven guilty.