Because it would destroy these losers' faith in the notion that these same athletes that they grew up idolizing and looking up to as the paragons of masculinity can never, ever, be fakkits.
If you ever want to test my theory, go into the next Magic Johnson / HIV thread that gets posted here and mention the possibility that Magic caught the monster from getting his back blown out. Despite all of the overwhelming evidence that that's the EASIEST way for a male to receive it, you'll get some crazy ass pretzel logic on why there's no way Magic Johnson ever slept with another dude and why he had get if from vaginal penetration, despite how difficult it is for a man to catch it that way.
Same for Eazy-E.