They’re evil. You don’t need the reward points and the benefits of not having one are far greater.
Extraordinary Money Hacks So You Can Save For Your Dream.
Tim Denning

This is far from a universal truth. I use a credit card exclusively for my purchases and I’ve never paid a cent of interest. On top of 4–5 mostly free plane tickets a year, I also get numerous other perks such as purchase price protections which save me around $100 a year. There are definitely people who can’t handle having a credit card, but saying that “credit cards are evil” is a drastic oversimplification.