I can have it both ways, watch me! Economic arguments are moot because the system is too complex to distill down to an exact science. (Economics is a social science, not a hard science - don't let anyone tell you differently!) And we have no way of knowing at a macroscopic level how plans/regulations will impact the greater economy.In that case, any economic argument regarding our economy and what will fix it is moot.
You can't have it both ways. Either the economic plans/regulations of the day have an impact on how our society fares in the global market, or it doesn't.
We do know that if you raise the price of beer, less people will buy beer.
We don't know what will happen to the 'greater economy' if less people buy beer. Does the reproduction rate fall because less ugly people are having sex? Do medicare costs skyrocket because of an increase in stress-related injuries?
The two major schools of thought (Keynesian versus Austrian) are based on ideological differences. It's all philosophy. And philosophical economics is basically modern day politics.
My preference is to let the free market determine winners and losers with regulation providing a level playing ground for consumers and providers. That's neither Keynesian nor Austrian.
Keynes would say the best government is the government that regulates everything.
Von Mises would say that the best government is the government that does nothing.