That's a valid point, but the same point could be made about almost any food, right (I mean who decided that humans should eat something like oysters, for example--they look so gross, but someone tried them, and now they're an expensive delicacy)? And soy or rice 'milk' is certainly not something that is found in nature, either--it's manufactured food. Aside from it being from a plant source, both crops are human-controlled, heavily cultivated (and now, GMO) crops.
I've never liked milk, anyway...although I can't stay away from ice cream
, and we eat a lot (too much) cheese, yogurt, and I bake for gift-giving at the holidays with butter. My personal theory (based on NO scientific information) is that if they really studied it, the hormones in our milk supply would be the most important link to increased rates of breast and prostate cancer.
Personally, being a Horticulturist, I'm much more frightened of the GMO farming and foods than the dairy (until the cows are all GMO, of course--ick).
I'd still like to hear more about why others stay away from dairy...any other thoughts out there? Any comments about my theories...