Not caring about the debt/deficit is absolute lunacy. It's like not caring about making bad real estate loans to people who cannot repay. For quite awhile it appeared like nothing was going to happen.
After all, why worry about the real estate market? We needed for it to keep on going. Why did it crash? It was unsustainable. Why will our debt/deficit matter? Because it is unsustainable.
Just because a whole bunch of voters aren't concerned about it doesn't make it any less of an important issue. It just shows a whole bunch of voters are ignorant of the effects of the deficit The more the interest payments grow, the more tax revenue is required just to service the debt (let alone make a dent it paying it down), and the bigger drag on the economy the debt becomes. And since you cannot begin to tax more than is already being spent, that drag will continue to grow until it swallows up the ability of the federal government to keep its promises and fulfill its constitutional duty. Then the crash will be far bigger than anything we've seen in our lifetimes. Why? Because the only way out at that point will be to monetize the debt even more. When your currency becomes almost worthless, how happy will you be when you had a few short-term prosperous years because you "didn't care about the debt/deficit"?