It's actually very serious.
The more we cater for obesity and allow it to flourish by making life better and easier for fat people, the more we are ruining humanity as a species.
One thing you might not have considered is that there are a lot of people who don't actually have a choice - kids from backgrounds where their parents don't give a damn about their health and lifestyle, and don't make them exercise, don't teach them proper nutrition, and cram them full of junk food.
It's a long term thing I'll grant you, but if we help educate people on what they eat, there's a chance they'll change. If we don't..then they won't.