The man is so desperate to try to create some sort of association between the Arizona shooter and "leftists"—and so inept at doing so—that he has written an article about political violence that doesn't mention word one about Timothy McVeigh.
Sure, he mentions the Black Panthers, the Weathermen, and other leftist boogiemen. But when it comes to actual, horrific, politically-driven violence? Not a goddamned word. Doesn't even dodge around it or try to change the subject. Just ignores it entirely.
Yes, he also engages in a fair bit of good ol' fashioned false equivalence. He babbles (there is no better word) about how Democrats supposedly use "crosshairs" and "targets" as well, and does it while conveniently ignoring how the Republicans and their Tea Party buddies pair it with the sort of violent, eliminationist, hateful rhetoric that you'd normally expect to find on Stormfront instead of on the websites of the "mainstream" right. THAT, you'd expect from a water-carrier like Douthat.
But seriously? Not a single word about McVeigh?
That's just plain pathetic.