On the other hand, the economics effects of credit cards, or credit/loans in general can't be understated. Some industries and therefor technological advances like cars or housing for example, would never be where they are without credits/loans.
In the same way i think that a lof of things like computers, tvs, holidays would never get bought without the existence of credit cards. And in the end all of that feeds the gigantic banking industry and can also be seen as the base of everything thats wrong with our financial system, as shown in the 2009 crash.