Have the divisions in the paleosphere become sharper? Or is it just the commentors at Free the Animal? I don't think one sees these sort of attacks at other paleo/primal websites. The Culture of Obesity. RN contrasts the Mediterranean culture (not 'diet') with Uhmerican culture as a way of explaining the rise of obesity. I don't think anyone in the paleosphere denies that one may be able to adjust to a high-carb diet as long as they are active enough (some would explain how this is possible by saying the activity affects insulin levels which affect how much of the carbs is converted to fat)?

Habits and the choices from which they develop do matter. But how much of our choices are made difficult by changes to our physiology and sense appetite because of diet? (And what impact does the adoption of a sedentary lifestyle have upon physiology?) There may need to be a balance between blaming the victim (or the culture) and the diet which circumvents making healthy choices or makes them difficult.

Edit. See this comment by a paleo MD in Italy.