There is a difference between a belief and an idea. I might have an idea about what causes some bug in my code, but it isn't a belief. I'm not trying to defend it, but to research it. Though I have met people who do hold beliefs about why code is broken. They refuse to consider the larger body of evidence and will cherry pick what we know about an incident to back their own view conclusions.

Can we recognize the beliefs we have that bias our work and then take action to eliminate those biases? I think that is possible when we aren't studying humans, but beliefs we have about humans are on a much deeper level and psychology largely doesn't have the rigor to account for them.