No politician of any party cares about the national debt, for two reasons:

Minor reason: Most of them gamble that they will be out of office before the situation becomes a true catastrophe, and it's a pretty safe gamble that they're right. So the blame will fall on sombody else.

Major reason: getting the debt under long-term control will require both significant tax increases and enormous spending cuts. Democrats generally pretend that tax increases alone will solve the problem, while Republicans pretend that the situation can be salvaged by slashing spending alone. In reality, both will be necessary, which means that to tackle the debt, politicians in Congress will have to propose and pass a series of hugely unpopular measures on a bipartisan basis (increase taxes + spending cuts). The chance they will do this is zero, because there's no faster way to lose your next election than to increase people's taxes or cut services they have come to rely on. But to do both would be a political death sentence.

So, basically, to solve the debt problem, we'd need there to be a large number of adults in Congress who are able and willing to make difficult, gut-clinching decisions, knowing that doing so will amount to political suicide even though it's crystal clear that such measures are absolutely necessary.

But there are no adults in Congress.