There is no Constitutional right to low-interest credit, folks.
Who is arguing that there is? After all, if it were a constitutional right then there would be no need for Fed rules, or legislation for that matter.
But doesn't it seem a little odd that you can carry a balance at a certain rate--a rate you may have planned on and prepared for--and then if one payment is one day late, then the rate on your prior balance can be jacked up a dozen percentage points? Why can credit cards do this while practically no other lender (to my understanding) can do so?
The proposed rules and legislation do not prevent people who go into debt from getting what they deserve as a consequence. It seems to me that they apply proper expectations to consumer behavior, for instance that when you borrow money at a certain rate, then that rate is what you'll have to pay. Or that when you're paying off a debt and you have debts at different rates, that payment will pay off the debt at the higher rate first. (Why should the credit card company have any say in what debt gets paid off first?)