I'm thinking you're the one who has no idea.
No one is arguing that we should try to run an $800 billion dollar deficit forever. We can't and we won't.
All you have to do is look at this chart:
and you see that the majority of the deficit originated from the economic crash and the vanishing tax revenues. When the economy gets back to full strength, a huge chunk of the deficit goes away without any tax rate increases.
But right now, on the list of stuff that matters, the deficit is way behind employment and GDP growth. And since fixing that "problem" with spending cuts negatively affects employment and GDP growth, we should wait.