Confirmation bias is a tendency to search for, interpret or remember information in a way that confirms preconceptions or working hypotheses.

Don Dodge (former VP of product development at Napster) estimates, based on internal Napster research, that Napster could have generated $3 billion per year for the industry, with minimal overhead. ... In the case of Napster, the copyright monopoly seems to have delayed the innovation we now call iTunes by a good part of a decade, and diddled musicians out of billions of dollars in the process, but copyright ideologues will not hear of it.

You can read the full article if you wish. It's a response/retrospective about the original Napster article.