I was a tiny baby who spent his first six weeks in an incubator. By the time I was eleven months old I was unbelievably massive. "My little Buddha" my mother used to call me because you couldn't overfeed babies in those days (late fifties). That's left me, through no choice of my own, a lifetime of battling obesity (what an ugly word, too).

I agree with many of your points.

Concern for others' health is an interesting point. Recall that the problem of medically indigent drivers & motorcycle riders provided the legal justification for seatbelt & helmet laws for adults in many states. That could become an issue for overweight people.

Others have already compared obesity to smoking. Also a fair point, given that we're constantly learning new dangers of obesity (e.g. cancer risk) as we are with smoking. Companies & insurers already exclude smokers, alleging missed work days & increased health issues. Why not do so for the obese?

Obese people can be healthy, as others point out, for a time. Personally I've never known an old-old person (say over 85) who is reasonably active & healthy who isn't just thin, but very thin. I seem to recall research indicating that consuming fewer calories than recommended by the USDA (or whomever) & being below ideal weight is healthier by far.

Oh, great!

And yeah, people frequently express concern over very thin folks. Mostly women. Remember Callista Flockhart? But also some men—people are more likely think cancer (or AIDS back in the 80s-90s) than eating disorder.

Diets & nutrition advice are mostly useless. I've written about that topic. Short version is that most such advice comes from people who have never had to follow it.