But the world is not objective. As much as we try to claim objective knowledge, the world is too complex to be proven. We inevitably call upon models, we inevitable omit data, we inevitably read bias into our evidence. Instead by claiming our objectivity, we're sanctifying our subjective ideas. If I claim that Keynesian economics is objectively correct, I'm not giving an objective proof, I'm simply trying to sanctify Keynesian economics as an infallible truth.
And by making that claim, I'm neglecting the empathy to comprehend that other people very well have their experiences and their data that indicates Keynesian economics is false.