Check out Krugman’s May 13th op-ed in the NY Times:

It’s an ill wind that blows nobody good, and the crisis in Greece is making some people — people who opposed health care reform and are itching for an excuse to dismantle Social Security — very, very happy. Everywhere you look there are editorials and commentaries, some posing as objective reporting, asserting that Greece today will be America tomorrow unless we abandon all that nonsense about taking care of those in need.

Emphasis mine. In the very first paragraph Krugman has exposed himself as an arrogant asshat who violates the principle of reciprocity. Thus, there is no need to read any further. Those who willfully and regularly violate the principle of reciprocity as Krugman does have outed themselves as poor critical thinkers, and therefore should not be taken seriously.