We do not need carbs but if you are going to have a healthy diet you will have no other alternative since I do not think popping pills count. But I would love to be proven wrong.

The imporantant point is there should be some room for nuance. When I was young there were litterly no obesy children at my school. Maybe one or two was slightly owerwight in every class. Despite that many ate candies every saturday. Some “free sugar” was not a problem then and does not need to be a problem today.