I don't buy that people find evidence to confirm their beliefs. People have beliefs because there is evidence.
That's just painfully incorrect. People do tend to ignore evidence that opposes their presuppositions.
For example, when people discuss a possible conspiracy in the NBA, they ignore the evidence that the only person to ever claim that there was a conspiracy is a guy who was committing fraud. If David Stern was truly controlling the NBA, its referees and its outcomes, don't you think there would be a bunch of people involved speaking out about it?
This lack of evidence is ignored in favor of supposed evidence based on how one interprets bad calls. They use the results to fit to the narrative.
In this specific case, if Boston were to win the next two games and the calls seemed to favor Boston, it would be said that Stern wants to extend each series for TV ratings. If the calls seem to favor Miami, then Stern is guaranteeing that Miami goes to the Finals, because it's good for TV ratings. No matter what happens, someone will say that the NBA is rigged. This is confirmation bias at its finest.
I also agree with your point - it is easy to decide "there is a conspiracy" and then whatever the scenario, use that as proof.
However, I should be clear. I have NO idea what the reason for the refs bias is. Obviously there are different possibilities, but I do not know them. As I said, it makes no sense to me that a league that can control games would limit the length of a series when there is more money to be made in a longer series. This does not mean there is not a reason, just that I don't see one.
I do not, however, expect a certain outcome Friday. I can see a scenario where Boston gets help, I can see a scenario where Miami gets help, I can even see a scenario where the game is called fair. So unlike some, this is not a case of "if Miami wins, it is because of the refs. If Boston wins it is because they are so good they overcame the refs." It is simply a matter of seeing what I see, with no preconceived notion.
That is the difference for me here: I am not looking for the refs bias, I am watching the game. I did that in game two and the bias was so obvious, so clear...it was sad.