The problem is that our political leaders don’t really understand economics, and they think you can pick and choose the parts of an economic system that you like while leaving the “bad parts” (the parts that don’t benefit our benevolent rulers) on the table. So we get MMT inflationary printing with military Keynesianism and Austrian austerity.

None of these systems work if you only take a part of the system! Any of them would probably be viable, implemented properly with a good understanding and fine adjustments to account for reality, but you can’t mix and match!