Here is the US, Milk is sort of something of a misnomer.
Very few other countries "force feed"(highly promote) lactose products to its adults.
In fact, in many other countries Adults *HATE* cow's milk. Only having lactose products such as Cheese or Ice Cream or other kinds of transformed products, which really reduces the amount of lactose and transforms it to something else, with things like rennet, which also transforms the taste that they cannot stand or hate.
So, no i don't think the seaweed thing in Japan is any different than the milke thing here in the US. And no, I don't think anything is *WRONG* with a person that is lactose intolerant, or seaweed intolerant. Just missing out on stuff they could have.
I never effectively said *ALL PEOPLE MUST DRINK MILK OR DIE!* as *you* took it.
I did effectively say: Most people could benefit from having lactose product in limited amounts to help for when they *WANT* a larger amount. As everyone is lactose intolerant to a point.
Its nearly the same thing with nuts, bananas, bean protein.