Credible here is the key word, you being the one that determines what is credible.
Yes, everyone makes judgments about credibility. The difference is whether you apply a method and try to correct for your own bias.
Let’s make it concrete. The January 6 Committee concluded that Donald Trump engaged in a sustained effort to overturn the election results.
I consider that credible based on multiple independent lines of evidence:
-His own public statements
-Over 60 court cases, heard by judges from both parties, rejecting fraud claims
-Testimony from his own DOJ leadership
-Statements from Republican state election officials
-Testimony under oath from people like Rudy Giuliani and Ivanka Trump
-Direct observation of events on January 6.
-Reams of memo's and false elector slates.
Many of these sources had incentives to contradict these conclusions and didn’t.
So this isn’t just ‘my opinion.’ It’s a conclusion based on converging evidence from multiple, independent, and in most cases adverse sources.
So what is your standard for credibility and can you debunk mine.