MMT is the secret sauce that conservatives fail to grasp when it comes to basic economic principals and why we can never have a green new deal under their watch as they are constantly afraid of the question, "How are we going to pay for it?"
TLDR: Debt and deficits are not lethal, inflation and a collapsing economy that can't raise taxes is. Spending by the government isn't taboo because every dollar spent by the government is going into the economy not evaporating into thin air. Example: Japan, which has a debt to gdp ratio is 264% yet they have negligible inflation. Even with a shrinking population.
It's when economy policy isn't moored to reality such as Turkey and Venezuela where they tried to print their way out of inflation without an economy that could absorb the spending is where the wheels come off the bus.
As Lemmy tried to teach us; Sovereign Debt is not the same as Personal or Consumer Debt.
Borrowing for things that improve infrastructure will ultimately bring in more investment and more tax. You earn more than you will spend.