Please Help Me Understand Why We Have Not and Are Not Spending Massively on Infrastructure

I am not an economist and I am certainly not a political economist.

That said, can someone in the comments section below, please explain to me why we did not take printed or borrowed money and allocate massive amounts of it to infrastructure.

We were (and are) printing and borrowing anyway, yes?

I remember tweeting about this years ago and never really got a response that helped me understand what I was missing.

It just seems to me that this would have at least been an earnest attempt to decrease unemployment, stimulate the economy and improve the US’s deteriorating infrastructure that is on display in NYC this morning as the subways are still fakakta a week after Sandy.

I must be missing something regarding why this was not and still is not the obvious good idea.

Are either of the candidates resolutely planning or promising in this regard?

Thanks for all thoughtful responses.