You're not wrong, but obesity should not be glossed over so quickly, as it is linked to several varieties of cancer, as well as numerous other serious health conditions.
The purpose is not to sweeten or adjust the flavor of whatever you're eating. It's to drive the addictive "must have more" response that your body naturally creates, selling more product.
It should be illegal.
Do you know of anything that provides a strong rebuttal to the research found in documents like this? https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3228640/
The only real thing we have done to combat cancer is stop smoking so much while at the same time increasing every other factor imaginable to promote cancer.