Yes, because at most you should have one month's worth of acummulated credit card debt. Anyone who doesn't pay of their credit card bill in full every month is asking for trouble.
Bingo. I take advantage of all of the perks my card offers and haven't paid a dime in interest or late fees. If I were to lose my job today, at the most I'd have about $300 in purchases accumulated over the past month that I would have to pay off to get my balance down to zero.
The people who carry a balance to buy expensive stuff, thinking they'll pay it off over time, are the ones who get in trouble when they lose their job and have a $5,000 balance at a 20% interest rate.