The shooting in Tucson was not an anomaly. It was an inevitability, and as long as we play this foolish game of "both sides are just as bad," it will be inevitable again.
The fact that the shooter is mentally ill does not mean that his mind and brain exist in a vacuum. Right-wing talkers were the first shooters in an increasingly uncivil war.
It's too soon to say what motivated the man apprehended for the shooting. But the Tea Party culture of political intimidation affirmed his violent impulses.