40% of the U.S. is overweight, 11% are diabetic, etc etc. There is no such magnitude of a problem due to erythritol or artificial sweeteners.
If "too many calories" were easy to solve we would not have an epidemic of it.
Now, implementing this is hard or maybe impossible for many individuals, I'm not denying this. The solution is simple, but for some it is not easy to implement.
It’s just that some people have mental addictions or whatever problems that makes them want to overeat or not exercise enough. But the solution itself is simple and straightforward.
Also, you forget that sweeteners still cause an insulin release and some research shows that their effect on metabolism might be even worse than sugar itself because, being zero calories, they do not contribute to the sense of “caloric satiety,” so for the same volume of food your body has released more insulin.
It’s convenient for companies to claim sweeteners are safe and sugar is the devil, but consumers should take such a claim with a grain of salt. There is no silver bullet, and dietary sciences is a field of bad science and enormous commercial incentives to lie. A good rule of thumb is whatever we have consumed for thousands of years is likely not that bad. Sugar in quantities should be avoided, but elsewhere you have claimed that it is bad for you and I have to disagree with such hyperbole, compared to something we’ve eaten for less than 50 years created by food lobbies.