The issue is that you are claiming that artificial sweeteners are morally corrupt. Please try to keep up with the class.
Artificial sweeteners are a trivial matter, unlike such fundamental an issue as sexual practices in the Western Civilization. However, on this microscopic level of sugar substitutes, I can see situations when it is morally good to use them, and I can see situations when it is morally bad to use them. I can build several analogies between desire for nutrition and desire for procreation, but none seem to contradict my conviction that contraception is universally a moral wrong. So if you have a particular analogy (or even equivalence) to build regarding sugar, please do so and I will be happy to discuss it with you.