I agree with the reasons above. I would also add that disputing a charge on a charge card is MUCH easier than disputing a charge on a debit card. Also, many banks restrict how much you can charge per day on a debit card. So making large purchases, even if you have the cash, is safer if done via a charge card. Think of it like a debit card with huge perks. You also need a credit card for emergencies: they complement each other, but don't replace each other.
