Let's take the issue a step further:
If you support the idea that this is child abuse or neglect to the point that it's harming the child's well being, do you support the idea of the child being forcefully removed from the home by CPS?
In some instances, Yes I do.
I agree it's partly the food industry. We have little choice but to feed our kids food full of hormones, chemicals, and preservatives. But you can still control the amount that you allow them to eat while they are young. You can also control the amount of time they spend in front of the TV, computer, and video games.
Some kids are going to be overweight no matter what. But there is a difference between a kid being a little chubby and being hundreds of pounds overweight.
When you risk your child's health by neglecting them, denying food, medical care, education etc. they can be taken from you. I don't see how risking their health by letting them gorge on food would be any different.
You can google Jessica Gaude who weighed 400 lbs at 8 years old, and see what that child went through before she was removed from her mother's home. Or a child named Jared who was 120 lbs at 3 years old until he was taken away from her. He dropped 70 lbs and was able to play like a typical kid.
In most situations when the child is simply overweight, I don't feel like any actions should be taken. You certainly don't want to traumatize the child and lead them to an eating disorder.
However, in those extreme cases where the parents are letting the children eat themselves to death, something has to be done.