I think that posting nutritional information is an excellent idea.
Last week I was in a restaurant that had nutritional information for each choice printed on the menu, and I changed my order as a result. It wasn't my first choice, but when I saw the difference in fat and calories between my first and second choices, it would have been irresponsible to go with the first.
For those who choose to disregard it, it does no harm. For those who choose to make responsible choices it does good.
Darwin's law will sort it out in the end.
By the way, I enjoyed my second choice.