I believe the answer is very much more complex than any of those offered here or in the screenshots above. It's because a cow is a whole different species than us and therefore drinking its milk has no level of intimacy, whereas drinking human milk is extremely personal and intimate. In the same spirit, I find human feces or urine much more repelling than cats' or dog' excrements.
Hurrah for a dull and impersonal world where the employee could just as well be a robot and the food something that's produced by one. Actually... it is.
I was born in Germany in 1965 and the book was still a central part of small kid's early socialization. Every child of my family or in general had been confronted with it. The thumbsucker story on its own made the content so absurd, even for a 2-3 year old, that messages like "don't be racist" or "don't hurt animals", which were rather progressive by the time the book was written, and sadly even in 1965, would not come across and all we would remember is that black people are called "n---" and they usually wear a loincloth made of grass. Luckily, the progressive wave of thought of the 70's washed all that away.
I sometimes receive letters from students applying for an apprenticeship (although I never offered any). I'm always shocked at how bland and formal they are, so I just send back a formal response, the sort a machine would maybe produce. Since it's a creative job, I would really enjoy receiving messages that are more expressive, like this one.
Yeah me too: emails and documents back to 1995, my first computer year. But it's all good. Like a black box of my life including whole relationships, jobs and penpal friendships. The only real issue is those damned browser tabs, but I found a solution: either clean them up one by one every other week or just dump them all at once.
Yes and bees too. Oh and birds...
Everything has two sides to it, I guess.
1) I could make an entire fanzine without a computer
2) I have no kids
That would be... uh... its center. No?