This isn't really a constructive way to look at the problem and I'm saying this as a former coach. If it was as simple as just eat less and exercise, everyone would do it. The thing is, it's not. It might be for you, in which case good for you, but a lot of people have been brought up with absolutely disastrous food habits, mental triggers for stress eating, etc, and all of these are ingrained in their body. It's often to the point that the way their body functions is fundamentally different from how it does for other people. Biological signals, their amplitude, how your brain perceives them, it's all way off.
All of this is a very long winded way to say: these people are unwell and rather than criticize them for being lazy or unwilling, we need to support them. Many (most?) of them come from an environment where they had very little say in achieving a positive outcome and now they're stuck with what they got. Breaking out of it is hard — statistically nearly all eat less and exercise regimes fail. Rewiring your body isn't an easy thing to do.
All of this is a very long winded way to say: these people are unwell and rather than criticize them for being lazy or unwilling, we need to support them. Many (most?) of them come from an environment where they had very little say in achieving a positive outcome and now they're stuck with what they got. Breaking out of it is hard — statistically nearly all eat less and exercise regimes fail. Rewiring your body isn't an easy thing to do.