It is widely believed and accepted at this point that in 2002, there was some level of NBA officiating conspiracy to favor the Los Angeles Lakers over the Sacramento Kings in the Western Conference Finals, the objective being to assure the very popular Lakers franchise made the NBA Finals where interest and ratings would be higher. Many YouTube compilations have been made dissecting this, you can look it up, the evidence is fairly overwhelming.
One can be a huge NBA fan and believe this. In fact, it was big NBA fans that drew attention to it. There have been other questionable cases in the NBA and other sports, perhaps none so blatant. The NBA deserved to be held to account and lose credibility over that, and in many minds they did. They either haven't done something similar since, or haven't been obvious about it.
For some reason, in my view there is a contingent of NASCAR fans who conflate being loyal fans of the sport with defending and excusing everything NASCAR does. Providing the "Final Four" a competitive advantage should not be acceptable, and rationalizing it every which way is shoddy thinking IMO. If it is true as many reasonably suspect, it is wrong and shouldn't be happening. One should be able to say that and still be a fan.