From Ivo Mosley's Bank Robbery: Economists and the Banking System (from Medieval times to Adam Smith) at PositiveMoney:
Petty recognised that banking increased the money supply and he recommended it for that reason ...
Petty’s recommendation of banks included no assessment of how the new money, its creation and allocation, might advantage some and disadvantage others. His preoccupation was: will the new money be put to productive use? (if so, good); or will it be frittered away in idle consumption? (if so, bad). This way of thinking has come to dominate economic thinking.
The notion of "good" debt versus "bad" debt has come to dominate economic thinking, Mosley says, and that's not a good thing.
I agree. Mostly, it is the excessiveness of debt that makes debt bad.