Bayesian Definition of Evidence

The Bayesian formula allows you to quantify the strength of evidence too. People often ask themselves, is this observation consistent with my working pet theory? And if so, then I counted it as evidence for my theory. The actual question should be: Is this observation more likely under my theory versus another theory? A stark violation of this Bayesian definition of evidence would be a congressman arguing for internment of Japanese Americans because they might be spies for Japan.