The federal government is shut down, we’re about to hit the debt ceiling (with disastrous economic consequences), and no resolution is in sight. How did this happen?

The main answer, which only the most pathologically “balanced” reporting can deny, is the radicalization of the Republican Party. As Thomas Mann and Norman Ornstein put it last year in their book, “It’s Even Worse Than It Looks,” the G.O.P. has become “an insurgent outlier — ideologically extreme; contemptuous of the inherited social and economic policy regime; scornful of compromise; unpersuaded by conventional understanding of facts, evidence and science; and dismissive of the legitimacy of its political opposition.”

But there’s one more important piece of the story. Conservative leaders are indeed ideologically extreme, but they’re also deeply incompetent. So much so, in fact, that the Dunning-Kruger effect — the truly incompetent can’t even recognize their own incompetence — reigns supreme.

To see what I’m talking about, consider the report in Sunday’s Times about the origins of the current crisis. Early this year, it turns out, some of the usual suspects — the Koch brothers, the political arm of the Heritage Foundation and others — plotted strategy in the wake of Republican electoral defeat. Did they talk about rethinking ideas that voters had soundly rejected? No, they talked extortion, insisting that the threat of a shutdown would induce President Obama to abandon health reform.