Right there that's it.
This isn't the same as your friend that thinks the world is flat or wacky conspiracies like the moon landing was fake...or people in government are aliens like in 'They Live' and whatnot.
The ref issue is a legitimate concern for the league given how consistently bad its gotten, and whether publicly or not, needs to address its issues regardless of the 'why'...whether it's just them being too old (excuses) or something more egregious like them gambling/being on the take...the 'why' doesn't matter...they need to get it corrected...or else the noise from the fans will only get louder concerning this topic.
No one can just brush it off and say it's not possible or it's never happened (when it has) that there may be some funny business going on with some of them as that'd be essentially the same as believing the world is flat.
Optimism bias is the belief that each of us is more likely to experience good outcomes and less likely to experience bad outcomes.
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