> Because it's not worth the cost.
Neither are airbags in cars, yet the government stepped in and made them mandatory.
> [Credit card companies] all have the incentive in the world to start rolling out chip and pin technology.
No, their incentive is to make sure people keep using credit cards.
They've done the math and concluded that the amount of user confusion resulting from chip and pin technology resulting in less credit card use is less than the cost of fraud. The fact that chip and pin works in Europe, and also that credit card processors still exist in Europe proves that implementing chip and pin isn't going to drive Visa and Mastercard out of business.