Is it though? I have read that it's very difficult to show cause and effect - do those health conditions cause people to be in larger bodies, or is it the larger bodies causing those health conditions? This is apparently not as clear cut as we've been led to believe.
But I think the important thing to remember is that people aren't in larger bodies just because they are endlessly eating 😱 We're all a product of our genetics, the environment we live in, the people surrounding us and the things that have happened to us. Dieting isn't the answer, it doesn't work long term (more then 5 years) for most people (apparently less then 5% of people). You could say that being really tall has some poor health outcomes, there's no fix for this, but we don't tell tall people they need to sort themselves out. I think we should be supporting people in having a healthy relationship with food, rather then restricting, and judging, and we need to do something about the diet culture we're all living in, it's so dangerous and also not helpful to judge people by their size and to continue the rhetoric that thinness must be the goal above all else.
Also do you think if someone is addicted to alcohol or heroin that you can talk them out of that? I don't disagree that addiction could be very destructive for their lives and relationships, I'm pretty sure no-one in that position wants to be in that position, but at the end of the day it's up to them to want to make a change or do things differently. You could support that person by looking at the cause, if they wanted to.. Perhaps they are depressed, grieving, have lost hope, don't have security in their home or family. But you can't make them stop using/drinking. Equally if someone had low self esteem or wanted help with improving strength/flexibility/time to do activities they enjoy, you could support them with that, but that should be coming from them, not what you deem is right for them, and shouldn't be centred around weight loss in my opinion.
I think you're last statement is incredibly dramatic, but we all have to make our own choices in life. We all make subjectively good and bad ones, we could all probably do with more support to care for our own well-being. But telling a child they're too fat, showing them pictures of how they looked when they were ill, isn't supportive in my opinion.