No excuse for obese children. I find it inexcusable having a large amount of obese people in society. Now I'm talking about fat unhealthy people, not just big people. There are some "big" people who are fit, and strong or "solid" - however obesity is just inexcusable - though loads put excuses attributed to it, such as genetics being the favoured one as well as medical issues and so on (which is fair enough). However that's so rare it falls well outside of the standard distribution and undoubtedly less than a few % actually have a genuine issue.
Something I've found personally though is that you have to 'want' to lose weight to have any chance of achieving the weight loss. It's why I find it very insulting when people talk about 'acceptance' and how it's 'okay' to be overweight. It simply isn't, it's a health issue and a resource drain and all it does is give more fatties an excuse to quit the diet.
Can we blame the parent fully though? I don't think so. Food is a very interesting concept as it isn't just seen as a energy source, it's also a reward, a treat, it's a comfort, and it's even a form of payment. People are fed constant nonsense with the fad fact of the year, things like 5-a-day or breakfast being the most important meal of the day or any of the 'facts' about your metabolism. You can even mix them all up, skip breakfast and halt your metabolism and get fatter than if you ate breakfast, eat 5-a-day throughout the day so your metabolism doesn't slow. It's all a load of nonsense but it is all backed by some pretty convincing parties, even the government.
Fat kids I think can be blamed on a variety of factors not just the parents. Clinically obese kids though should have their parents named and shamed.
We should spend the NHS money you're inevitably going to later on them now so they won't need the pacemakers at 30 years old.