Interest payments on the debt are very low as a % of GDP. And interest
rates are so low as to be irrelevant. So taking on long-term debt right now does not really cause problems -- especially because future growth and inflation will erode the true cost of the debt. The rates are mostly fixed for decades at historically low levels.
The problem comes when interest rates rise and the US continues to spend, because we don't fund government at its current levels from national income and rely on debt. Or when rates are high and we have another crisis or war. Or when no one wants to lend us money anymore.
But none of those things are true today, so we can use debt to avoid the worst impacts of COVID and we
should use debt right now to invest in long-term infrastructure (trades/job training, transportation, public works, power grid, etc). And, IMO, to redress the incredible income inequality that's developed since 1980. It was policy-ed in and it can by policy-ed out.
There likely will be a crisis at some point in the future, when the situation is different and we don't adjust our spending, but today we can do it.
This video from Ray Dalio is fantastic IMO. And he talks about how to "beautifully de-leverage" at the end (which is where we have been for the last 10 years or so). 27:00 is where he talks about the value (and risks) of government debt in a deleveraging and how it does not cause inflation if it's offsetting a decline in total credit. The situation is different than 2008, but it's a relevant point today as well and it's worth understanding.
Trump's Tax Cuts for Billionaires program wasn't bad because it increased the debt, it was bad because it increased the debt in an inefficient way -- with less of the money going into the "real" economy than should have happened.