Are obese people their own fault? Why do we feel sorry for them or offer them handouts?

Let me tell you something, all throughout high school I was 6'1" tall and weighed only 120 lbs. It was humilating, four years of non-athleticism, depression, ostracism and datelessness, but as I got older, my fast metabolism slowed down, at one point I ballooned up to 172 lbs. b/c of an unhealthy diet and a sedentary way of life. However, I no longer eat meat, fish, poultry, dairy, eggs, fried food, alcohol, high fructose corn syrup, cola....I stick to fruit juices, water, beans, rice, pasta, fruits, vegetables, soy....and as a result I am at an ideal weight. Why do people who stuff their faces with fast food and Cola and fried food and high fructose corn syrup lamen their weight gain? Yes, some people have problems with their metabolism (I have been there), but seriously isn't the obesity epidemic really just a result of poor living and bad choices and the fault of those who pursue this reckless way of life instead of being disciplined? I have self discipline when it comes to food, plus I walk home from work which takes at least 40 minutes, so why should I feel sorry for people who don't?