Sure, and just like with grain and other staples dairy is a massive, profitable industry with public and government lobbying organizations, like the one you linked. I'm not picking a fight with you and have no qualms with dairy consumption, I'm just saying your sources are potentially just as biased as the wheat based food pyramid. If you're trying to convince people milk is healhy there's better options. And as far as necessary for civilization, it's not like every human society in history emerged cultivating cattle.