What was the real point of this posturing? After 49 years you are surely aware that American Express is a mass-market card issuer, and there is no possibility that policies will be changed to accommodate one customer.
There was no point and words like "unconscionable" and "outrageous" make people otherwise inclined to help the poster want to throw the letter in the trash. "I hate you and everything you stand for, but by the way, please let me be your customer."