Democrats frequently ask me why the Republicans have become so extreme. As they describe the situation, they usually fall back on some sort of illness metaphor. Republicans have a mania. President Obama has said that Republicans have a “fever” that he hopes will break if he is re-elected.

I guess I’d say Republicans don’t have an illness; they have a viewpoint. Let me describe it this way: In the 1950s, Dwight Eisenhower reconciled Republicans to the 20th-century welfare state. Between Ike and George W. Bush, Republican leaders basically accepted that model. Sure, they wanted to cut taxes and devolve power, but, in practice, they sustained the system, often funding it more lavishly than the Democrats.

But many Republicans have now come to the conclusion that the welfare-state model is in its death throes. Yuval Levin expressed the sentiment perfectly in a definitive essay for The Weekly Standard called “Our Age of Anxiety”:

“We have a sense that the economic order we knew in the second half of the 20th century may not be coming back at all — that we have entered a new era for which we have not been well prepared. ... We are, rather, on the cusp of the fiscal and institutional collapse of our welfare state, which threatens not only the future of government finances but also the future of American capitalism.”

To Republican eyes, the first phase of that collapse is playing out right now in Greece, Spain and Italy — cosseted economies, unmanageable debt, rising unemployment, falling living standards.