Stephanie Kelton? She's fine. Literally 100% of her time is just spent explaining that the debt doesn't matter and that given the US's trade situation the government should run a deficit.
My understanding of the National Income Accounting Identity is that given the US's trade situation, we HAVE to run a deficit because of our status as a net exporter.
(G-T) = (S-I) - (X-M) or Fiscal Deficit = Net Savings - Net Exports
rearranged you can say: Net Exports + Fiscal Deficit = Net Savings
If you are a net importer, then X-M is a negative number, so in order to have a private sector that is not forever going into ever-increasing private debt, you actually have to run a Fiscal Deficit or crash your economy until your citizenry does not have enough excess cash to afford imports and/or significantly reduce private investment to rebalance the equation.
I actually think the MMT people are wrong in terms of the fundamentals, but their policy prescriptions are basically right for where we are right now. They are basically like right for the wrong reason.... but I'm also not an economist, so