Well the health stuff is all straight from my doctor. There are test available for such allergies through US BioTek:
http://www.usbiotek.com
And I'm pretty sure the agricultural revolution is agreed to have been around 12,000 years ago. Certainly, seeing as I wasn't there, I'm open to alternate histories. But if you don't think that the omnipotent Flying Spaghetti Monster created humans with the innate ability to farm, then you can imagine a time before agriculture. A time that presumably lasted much longer than the section of history in which it has been used due to the tendency for agriculture to be less sustainable than stable ecosystems. Maybe that sounds like a hole for you to poke, but I submit that this is self evident as forests are often hundreds or thousands of years old, where as modern agriculture, and even prehistoric agriculture required maintenance by humans.
Aside from that, agriculture is much more work than hunting and gathering. But farming has a few benefits, like surplus and a certain sort of consistency, though things can still destroy crops. Once you harvest the grain, there is a lot of grinding to go through to arrive at something to make bread out of. Not so much if you make porridge, but the point is that all of these things would be discoveries, meaning there is a time before their use.
I should mention that the dairy I was referring to was cow, and that most people find goats milk easier to digest.
As far as humans using milk of mammals, I know that the history books state that semitic herders inhabited the area surrounding the explosion of the agricultural revolution. So I assume this means that dairy has a longer history of use. Still, the same argument applies. At some point there were no humans sucking other tits. The amount of time between when we started with the tits and now is less than the amount of time previous.
I can imagine you thinking now, 'when does he consider humans to be humans?' I don't know, I think the scientific consensus is for about 200,000 years. Either way, its been many many years.
Do you see any other animals suckling at the tit of another species?
Oh and coffee. I mean, if you are gonna drink an energy drink, coffee has all the caffeine and naturally inherent vitamins and minerals, and none of the creepy ingredients. Plus it makes life kick ass.
I'd hardly call it propaganda.
Sorry to hear that salmon is more expensive where you live Restin. How is your body feeling these days anyways?