They are also often the best method consumers have to borrow money for many purposes.
(The only exception would be in a deflationary environment.)
Although it has to be said a running balance is not actually a direct credit risk. It doesn't make financial sense, as you're racking up interest fees, but if you are safely managing your payments (no late ones) and your credit usage (a percentage of what your total available credit lines are) then it's not a bad thing for your credit score.
Not that I would recommend it of course.
Seems a bit like Trump supporters.
The more you demonstrate your ability to manage debt (and you can do that by simply paying off your card every couple of weeks) the better you demonstrate your ability to do so. More data points, so to speak.
Of course if you can't manage that then that's data too.