Earlier quoted context omitted.
Krugman's science is economics. Economics is pretty much the pinnacle of politics intersecting with science. His view on the science is that the Keynesian model is correct, and he sees an entire political party which has embraced the Austrian model which most economists disagree with. This is why he writes passionately in support of government spending during times of recession/depression. He argues, correctly in my…
I don't disagree with the essentials of what you said, and in fact Krugman himself sits pretty near the peak of economics, but... 1. Krugman-cum-commentator occasionally contradicts Krugman-cum-economist. For example, [1] 2. Krugman falls into the same trap as most economic commentators, in assuming that one side of the Keynes/Hayek divide has been proven right (which side depends on the commentator in question), ref…
There isn't a science that can make reliable predictions if the model relies on inputs consisting of even a tiny bit of human decision making, and economics is completely controlled by human decision making.