Borrowing money isn't a problem if this money is being wisely and efficiently invested by the countries. It means the country is developing new sources of future incomes which can be used to pay for the loans, while generating value and quality life for the citizens of that country.

Even billionaires and millionaires take loans to boost their businesses, and on long run it's worthful because if they had to save their own money before starting a new investment, it would a long time. And as we know, time is money in financial world.

The problem here lies on the fact most managers borrowing money aren't planning carefully how they are going to use it. Then they are creating only debt for future generations.