Someone who overeats is not going to physically induce harm to someone...unless of course they are super hungry and someone is holding a cheesburger, lol. 
Drug/alcohol abusers are not "in control" of themselves or their surroundings and can involk physical harm to others (via car accidents, cooking/smoking then passing out causing fires, become violent because they need a fix, etc.). If someone (government) can prohibit drugs (alcohol at one time) they should be able to make serious abusers have a device implanted in them to stop them. Hell the government is making 16 year old girls take a drug to keep them from getting cervical cancer...
What about the people who have to lift fatties in the hospital or care for them once disabled? What about the children with severely diabetic parents pr daddies that can't play catch, give piggy back rides? What about the skinny wife/hubby crushed underneath the girth?
And here's one more thing....... despite the myth, fat people are not jolly. You'll never have a bigger pain in the butt than a morbidly obese patient. It has something to do with publicly losing their independence so they get mad at the world and aren't big fans of the hospital's dietary restrictions. Putting them on 1800cal/day makes pushing down emotions with food impossible.
What about the eyes of innocent bylookers, Cheri?!!?!! What about our eyes?!!?

I'm in a silly mood..... 3rd cup of coffee is kicking in.