Blame the people, not the credit card. It's not the one that fuels the addiction but rather the person itself.
The credit card was not meant for gambling. It's served another purpose that's why don't say credit cards fuel gambling addiction.
In short, why not just blame those stupid person that allows themselves to be addicted gambler? The credit card has nothing to do with it. Besides, it's not easy to be eligible as a credit card holder. I do see that most credit cards holders are not even mostly into gambling.
Exactly, people seems to be looking for 3rd party to blame for their own mistake. If this mindset continues, there will be people who start to blame the devices (technology), the internet, the casinos, etc because these things can be said as thing that help people jump into addiction. Blaming credit card does not make any senses obviously, addiction will come even gamblers has no credit card. The chance for people to gamble when they are out of money still exist, once someone is addicted, he/she will try to get some money from different ways such as selling stuff, getting a loan, or even doing criminal like stealing.