Another reason why Bitcoin (or something like it) does have legitimate benefits...
Downside of single (exploited) mistake in bitcoin wallet management: total loss of value.
...is a lot less damage than 40 million exposed credit cards
Getting my credit card details stolen is going to be less damaging than all but the smallest wallet thefts.
Ignoring the absurd interest rates, fees, insurance that cc companies charge...you assume that credit card/debit card theft costs are never passed on to the consumers