Frank Rich's most recent New York Times column explains how crimes of this sort are part of a bigger problem egged on by right-wing media:

This homicide-saturated vituperation is endemic among mini-Limbaughs. Glenn Beck has dipped into O'Reilly's Holocaust analogies to liken Obama's policy on stem-cell research to the eugenics that led to "the final solution" and the quest for "a master race." After James von Brunn’s rampage at the Holocaust museum, Beck rushed onto Fox News to describe the Obama-hating killer as a "lone gunman nutjob." Yet in the same show Beck also said von Brunn was a symptom that "the pot in America is boiling," as if Beck himself were not the boiling pot cheering the kettle on.

We have a real right-wing media accountability moment. Ask yourself how this compares to the mainstream media's current obsession over David Letterman's apology to Palin.

Shouldn't they be more concerned about the harm caused by the shrill pundits of the right?

Seeing "a strange double standard in effect" here, Karr feels the murders to be so "horrible that it's silly to have to compare it to the Letterman/Palin affair. And yet the mainstream media seems to think that one deserves more attention than the other."