I don’t think interest, or credit card interest is evil. I believe that consumers generally understand the choices they’re making, even if you or I might make different choices. And people do need credit. If you didn’t have credit cards, the need for credit would still be there, and consumers would be left with the next best option.
If you need to fix a car to get to work, or pay a medical bill, credit cards are a better way to do that than payday loans which are better than having your legs broken. You’re paying interest, but you’re also getting something of value in return.