30 Trillion of Debt AND Failing infrastructure??

I’m so confused how we have that much debt and almost every major infrastructure system in the US needs an overhaul. What on earth did our taxes do? As a tax payer, I demand to know why we have almost nothing to show for our money asides from the shiny military, who also according to multiple news agencies is woefully under-equipped. We need to rejuvenate highways, we have no high speed rail, bridges are archaic and crumbling, government buildings are falling into disrepair. Do you guys understand how staggering an amount 30 trillion is? How long and hard it is to spend that much? The only plausible answer I can think of is that defense contractors gouged the government and military, fake research universities took the money, and we just shipped it off to foreign countries. All time stock market highs are real estate values are where all this fake money is being stored. I doubt we’d have a recession because all the overlords who spent that 30trillion won’t let it happen while their money is buried there.