So given this evidence, I don't see how blaming people for not understanding this is productive. Especially considering how much our government supports junk food starting in public schools. If the food reward hypothesis of obesity is correct, then susceptible people are fucked in America as soon as they start watching TV ads.
General health is an issue for society. America has completely failed at this. Sugar is something that's easy to cater to people. It has an addictive factor, it's incredibly easy to like, and the brain tells you "this is awesome" when you eat it. The brain also says "this isn't awesome, get me some more" when you don't eat it.
But still, without blaming this at anything specific, what has happened in the US is that things are only driven by cost. Many things point to corn syrup being a horrible, horrible sweetener, but it's cheaper than sugar, so use that instead. And the whole industry is so big, because who doesn't love a chocolate now and then? Aren't we allowed junk food once in a while? Most of us enjoy it, but we know it's not good and/or feel like shit afterwards, and stay away from it to varying degrees.
So the industry grows. And they lobby. The corn industry is subsidized by the government, and twice as much corn as is needed is made yearly. Let's shift focus away from the society's responsibility (directly) and look at companies themselves. They have such a good cash flow that they can throw
a lot of money at advertising. Healthy counterparts just can't. Let alone the fact that the healthiest things are the things you make yourself.
I think this is one of those times where someone that's not thinking about how much you can make off of something should come in and restrict these things. Money is a great driving factor for a lot of things, but health really shouldn't be one of them. What really annoys me is that a friend of mine, that I know would say otherwise, also shifts the blame to the individual, saying "just because it's advertised, doesn't mean you have to go out and buy a chocolate" - and here is where what you said comes in.
Society is much better suited for the role of health caretaker, because putting in the right foundations for a healthy society is an objective goal, and fixing your own health once it's askew is a subjective and often very, very demanding thing to do. We can, even maybe rightfully, blame society for being fat, but that doesn't mean we should. In the end this is our life. We shouldn't sit back and say "well, society fucked me up" and just continue down a destructive path. When society fails, you should care enough for your body to take matters into your own hands. Maybe research what those preservatives and sugars are doing to your body. Figure out how much fat and carbs is in meats you eat.
Society is the problem, but finding a way to help individuals even though society fails is key. And things like "fat rights" is just a joke to that. Sure, you can pout that you have a right to be fat. You have a right do kill yourself, too. It's your body, we're not going to force you to be healthy. But just don't act like you want it this way. That's what disgusts me. When you start with such arguments that fat was beautiful in Rome, then you're justifying that you are fat. It's not justifiable. Be happy with who you are, but strive to better yourself.