The appropriate question is not “Who will build the roads?” but rather “Who will pay for them without taxation?” History suggests the answer is "lots of people" and the "public goods" theory is wrong.
We can see that these massive trillion-dollar stimulus programs generate a virtually nonexistent long-term positive impact, just a short-term bounce that lasts less than a quarter.
It is not possible to replace productive credit by means of the easy monetary policies of the central bank. If this could have been done, then the world would have already ended poverty.