Thats because it is wrong, youve hit the nail on the head. Anything that is sweet activates certain receptors on your tongue, and that stimulates the production of insulin. That insulin is then going to travel your body looking for sugars to break down. Thing is, insulin only breaks down sugars, not artificial sweeteners. So its going to break down sugars elsewhere in your body or leave free insulin in your blood. That fucks you up good and leads to diabetes.

ALL ARTIFICAL SWEETENERS ARE BAD, unless you already have diabetes.