It's a fallacy for anyone to think they have to pay interest when they use a credit card. It baffles me that half of USA citizens carry a balance on a credit card, and does in fact pay interest - that's very bad and I can hardly believe it when I think about it a bit.
I always pay my balance and have never paid any interest charges. I even put part of my new car on a credit card, not because I didn't have the money (I paid cash for the car, as I've always done) but because I wanted the cash back. The dealership allowed me to put $5000 of the total on a credit card.
Unfortunately, a lot of Americans simply can't do that. I believe half of Americans, perhaps more, said they couldn't come up with some small amount like $400 in cash if an emergency happened. They simply have no savings and live paycheck to paycheck, so constantly paying off a credit-card balance is a way of life. It's sad, but true.