You wrote a very truthful and balanced post on this matter, @kylek717.

As you point out, the most damaging part of the "Healthy at every size" movement is that it affirms the insidious message that being overweight or obese is not only fine health-wise (which is obviously not true) but also some sort of immutable quality. It is even included in the very first line of their mission statement: To help people embrace the bodies that they are given.

People are not born obese. They become that way because of years of unhealthy habits (either self-developed or instigated by their families). What these people need to hear is that it doesn't have to be that way! Sure, it is not easy and will require a lot of patience and hard work, but you are not "doomed" to be trapped in a body you don't like or don't feel comfortable with.