Ah, then, this sounds to me of an example of misaligned ethics (you and example overweight person).

I suppose you could argue about the health and longevity benefits of being low bodyfat, restricting calories, regular cardiovascular activities, these are scientifically documented... however, allow me to assume for a second that you haven't maximized these to their utmost. Do you, personally, fast to the maximum recommended amount, do cardiovascular to the maximum recommended amount, maintain a super cut bodyfat %, etc? Maybe you do quite well, but do you do it perfectly? Never drink alcohol (increased risk of cancer for even 1 drink a week)? Apply sunscreen in all cases you're in the sun (melanoma)? Avoid eating meats (cancer, cardiovascular disease)?

I'm going to assume no, because, what a life, right? You probably make some sacrifices to your longevity, for a life that's a little more chaotic and fun. So now the question is just, to what degree? I think that degree of variability is high, and I think it's perfectly normal to be fat and rational. I'm an example, lol, because I was once 15% bodyfat, 2pl8 lifter, 5k every other day kind of guy, and now I'm 10kg overweight. The upside is I get to eat cake, which I am obsessed with, and sleep in. I found a balance I'm happy with. I fluctuate towards and away 10kg overweight, never over, and have a life I like.

So when you see me fat, are you going to say I've lost control of my life? I think I have things under control. I think my ethics are in line with my actions.

That's part 1 of my thoughts, part 2 is a challenge to you to take some of my values that I'm more than happy to defend vigorously as ethical, and ask yourself (and tell us if you're open to it, I'm curious) what you'd feel if I asked you these questions:

1. If you live in a place that has elections, have you voted in every single election for which you've been capable, after spending a decent amount of time researching candidates first?

2. Do you prioritize taking public transit? Or, bicycling and walking, or similar?

3. The times you drive a private vehicle, do you rigorously give right of way to pedestrians and bicycles, even if it's not strictly legally required to do so?

4. You don't ever litter, right?

5. You regularly attend civil rights protests, right?

6. You write your representative about civil rights and other issues frequently, don't you?

7. You push for open-sourcing any code you write with stakeholders, yeah? And you open source all your personal project code?

8. You support strikers by not buying goods from companies undergoing a strike, and not crossing a picket line, right?

9. You are a vocal LGBT ally, right? And you challenge family and friends when they voice bigoted ideas?

10. If you are a founder or similar, do you follow the principles of fairness in labor by either profit sharing, or incorporating as a co-op?

11. You don't buy from companies that engage in slavery, wage theft, exploitative labor practices, or extreme environmental harm, right? Generally speaking, you check into this before buying from these companies? And you only shop local businesses, rather than monopolizing companies like Walmart?

If you find these questions surprising, tiresome, offensive, annoying, stupid, or ridiculous, can you see how someone might feel the same if you suggested they reprioritize their life around weight loss? Because it's not just a question of ethics and capability of self control for implementing ethics, it's also a question of prioritizing certain ethics.