Have you heard of "lactose intolerant" people? These are normal people who get sick from consuming cow milk. The rest of us have adjusted to handle it.
They're just people who's ancestors didn't domesticate cows and goats.
Humans are supposed to eat vegetation (that we forage), meat (that we kill) and, eggs (that we steal from nests). Instead we are eating processed foods, animals milk, and whatever other processed bull shit they sell these days.
We're "supposed" to consume whatever gives us energy to survive. If drinking milk doesn't make you ill then you owe your existence to domesticated animals; milk saved enough of your ancestors' lives to make a difference to your DNA. You could make the same argument against cooked meats and all forms of grain, fire and farming are human inventions.
Anyway, human breast milk is so much healthier for a human than cow milk. Cancer patients love it.
If human milk tasted nice to adults the species would be extinct, which is why it tastes like crap. This is also why most animals are lactose intolerant (yeah, believe it or not milk is bad for most adult cats), adult humans can only drink milk because of the domestication of animals.
