When I first met the Mrs she was into ‘lowfat’ everything because she thought it was healthy. At the grocery store told her to get her low-fat peanut butter and I got my regular pb. She was shocked to see the carb/sugar content difference. And that’s not even factoring in the benefits of good fat.
Very few people read the labels so they don't know much about how the crafty food purveyors add sugar and other items as substitutes for fat and the flavor fats add to foods.
Everyone needs fat as part of a balanced diet, especially because we need fat soluble vitamins like A, D, E and K. Vitamin D has now been established as an important element in the body's ability to fight the Wuhan Flu for example.