A system that is almost impossible (if used properly) to compromise still can be compromised. Meanwhile, ability to easily recover from such events reduces their significance and might be more valuable for some users.
The point is it's possible to be completely secure with bitcoins while credit cards are inherently vulnerable. And we are comparing apples and oranges. Bitcoin is a currency, credit cards are a service. You could, in theory, build a credit card company that deals in bitcoins. But why would you do that? There would be no advantage over just trading with bitcoins, and with bitcoins there is no chance of your credit card number getting stolen.
Someone can steal your bitcoins in the same way they can steal your physical cash.
"There would be no advantage over just trading with bitcoins" for me the purchaser there very much is, because in case the person at the far end is a scammer I have, in theory, at least some recourse.
