Nothing to worry over credit card over-spending.
The bad loans are already factored into the interest rate - that's why you pay 10-12% pa on credit card as opposed to 5-6% pa on normal loans.
Credit cards are small loans, and it is cheaper to write them off than litigate for recovery.
I have not seen credit card debts doing much damage to banking institutions - although individuals are known to get into trouble.
But it is always a sign when banks are keen to give out credit cards that the end is nigh for the economy - they are really going for the sub-prime customers.