No, social factors like the price of processed vs healthy food, the amount of sugar and salt companies are allowed put in food specifically to addict consumers, the food our culture uses to celebrate, the stressors and social pressures that we know drive people towards dopamine sources like high caloric foods, cities designed to discourage walking, etc.

Edit: no one's claiming what you're saying. Individual behaviour is a factor in most disease. Focusing on the individual behaviour piece has proved to be completely ineffective at producing weightloss. That's just a fact. And yet we keep doing it like it's suddenly going to work. It won't. You could tell people not to go to work in winter so they don't catch a cold, but they won't do that.