I've noticed that many of my commenters are reluctant to consider economics to be a "science" whatever that may mean. Of course one posssible theory is that that means that they just prefer to clinging to whatever prejudices they've accumulated rather than study the results of economics.
In any case, I decided to subject myself to a conventional course in Macroeconomics, taught by Nilss Olekalns of the University of Melbourne, on Coursera. I have a few other irons in the fire, so I'm not sure how far I will get, but so far so good. I would say that he has a reasonable defense of the science and its importance.