This is pure bs.

You get fat because your intake of calories is more than what you burn.

If you can't be bothered to adjust your diet or lifestyle to correct this, what kind of society and human beings are we making?

What a naive way of looking at things. Sure, everyone that's fat is lazy! There cannot be any other explanations, right?

You seemingly forget not everyone is as privileged as you are. Clearly by your take, you can afford to eat healthy and have the leisure time to exercise. A lot more people can't.

Who cares? If someone needs to eat less to get healthy, they can do that and: be miserably hungry or not.

It's like telling people they can't have aspirin during a hangover.

It doesn't follow that your body, when running at a calorific deficit, will continue to run the life support systems at optimal levels. In principle, it's possible (unless you're actually fasting, which is a whole different kettle of fish) for a reduction in energy-in to lead to putting on more weight, if your basal metabolic rate drops more than the food did.

It's complicated. What's true for some people isn't necessarily true for all people. Sure, I'm willing to bet a lot of people – probably most people – are able to choose how fat they are by adjusting their diet and exercise regime, without adverse effects on their health, but that's not a law of biology. I know as many people who struggle to put on weight as struggle to lose it.