It’s true that the shooter in Arizona appears to have been mentally troubled. But that doesn’t mean that his act can or should be treated as an isolated event, having nothing to do with the national climate.
Last spring Politico.com reported on a surge in threats against members of Congress, which were already up by 300 percent. A number of the people making those threats had a history of mental illness — but something about the current state of America has been causing far more disturbed people than before to act out their illness by threatening, or actually engaging in, political violence.
–Paul Krugman, who reports in his blog that he hated writing this piece. It is, however, absolutely essential reading.
Lemkin 