I'm by no means an "expert" on this subject, but I think this is something that really needs to be addressed and more widely accepted. You can read a bit more about HAES here, here, here or a million other places on the internet. A lot of the blogs I link to from here talk about HAES and related theory.
It's not fat that's the problem. Poor eating habits and a sedentary lifestyle are bad for you, no one is arguing with that. But what if you're doing everything "right" and you're still fat? Or you're doing everything "right" and you're still really skinny? That's where the concepts of HAES come in handy.
For better writing about this subject, check out The Rotund and Shapely Prose, then go read Lessons From The Fat-O-Sphere, by Kate Harding (founder of Shapely Prose) and Marianne Kirby (The Rotund). Do it!! There are also a billion other fantastic blogs dealing with the same subject matter, I just linked to these two today because I wanted to plug their book. :P