The lesson from the Tucson massacre for the Secretary of the Arizona Citizens Defense League, a guns right group, is that more people need to be armed, preferable with assault weapons, so that they'll be ready next time something like this happens at a Safeway. And they say the shooter had an elevator that didn't quite go to the top?
Confirmation bias (also called confirmatory bias or myside bias) is a tendency for people to favor information that confirms their preconceptions or hypotheses regardless of whether the information is true.[Note 1] As a result, people gather evidence and recall information from memory selectively, and interpret it in a biased way. The biases appear in particular for emotionally significant issues and for established beliefs. For example, in reading about gun control, people usually prefer sources that affirm their existing attitudes. They also tend to interpret ambiguous evidence as supporting their existing position.