I think you miss the point that infact, it is not always just their problem, it becomes a problem for society in general, well i can only speak for my own country, obese people will infact cost my country and the taxpayers in the long run, if something is not done about it.

We can all be the ostrich, but sometimes you have to become involved or go along with the government's policy in order to rectify a problem that yes was not of your own doing.