Few people cares debt

Mortgage Loan, Car Loan, Credit Card's charges are personal loans which everyone carries. Goverment bonds and loans, Corporate bonds and loans, Bank's liabilities which every entities carries. Our world are made by debts as the gloabal debt multiples the gloabal GDP. But few people dare worry. Why? Because the interest rate is so low that the borrower has to pay very little interest on the principal. In another words, he doesn't have to care about the debt. But how about the principal? He doesn't have to care about it too, because he can roll over the principal when the term for payment expired. Banks don't care about refinancing under "quantity easing". That's the world we live now. What's the consequance? Few people cares. Because it is the matter which central banks determine and is out of concern of ordinary people.