Earlier quoted context omitted.
Nothing particularly noble about porn, but it irks me that payment providers act as unofficial censors of business. Why should legal businesses be denied access to the de facto legal tender of 21st century? And on a whim of unelected CEOs...
I suspect it has less to do with their puritanical values and more to do with the enormous amount of fraud in the industry and the customer support load it places on them from the husbands, wives and children who swear up and down they aren't responsible for the charges found on the bill.
This is like saying "drugs are bad because of all the violence" when the violence is mostly a symptom of how we treat drugs.