Earlier quoted context omitted.
Helping obese people lose weight is unidimensionally a good thing
Obese doesn’t mean unhealthy. Correlation isn’t causation. There are many obese people who are extremely healthy. I for one have had no health issues of any sort, have great blood panels, and am in decent physical condition but sit stubbornly at a 31BMI. The only “issue” I face is psychological, and it’s rooted in precisely this statement you made.
I don't believe that's true. There are some cases (like powerlifters) who can be at an obese BMI but still have strong cardiovascular fitness, but unless you are in that narrow category, if you are obese you do not have strong aerobic fitness. 'Decent physical condition' alone belies that you are not 'extremely' healthy. Decently healthy maybe, but certainly not extremely. Even if you are still metabolically healthy, you are at increased risk for adverse long-term outcomes (source: https://pubmed.ncbi.nlm.nih.gov/24297192/). That is more than just a psychological issue, no matter how much you try to handwave it away.