That site is chock full of buuulllshiiittt. They're just another PETA wannabe site trying to scare and guilt you out of consuming a perfectly healthy animal-based product.
Milk is PASTUERIZED. That means that clean it off all the crap that was in it, "cow's blood"(what??) pesticides, germs, whatever else.
The mistreatment of domestic animals is unfortunate, but it's NOT COMMON, and the farms that are found to abuse their animals are heavily penalized, because it's illegal.
Goddamn tree-hugging hippies spreading lies about milk. What else would I have with my cookies??