You're right, that last paragraph is a flawed argument. I retract it, and your findings compel me to assert that I think there was probably never a good reason

You're right, that last paragraph is a flawed argument. I retract it, and your findings compel me to assert that I think there was probably never a good reason for the FDA. But it's the second, and weaker, of the two arguments I made. The argument I develop in my first three paragraphs stands.