I think most people here agree that it's the parents fault, and not the child's. People will view difference in ages though. Personally, I view anyone under ~12-14 years old as products of their parents' control. Grey area between 12-16 years old. But after 16 you're basically an adult who should control their own impulses. As for how you should feel about fat children, it should be abuse, and they (the child) often do not know any better.