For those who aren't getting the subtext here: cow's teats are fucking filthy, covered in mud and straw and all kinds of stuff. They also sometimes step on them when they're getting up from sleeping. Best case scenario, they just wipe mud from their hooves on it. Worst case, the hoof cuts the teat and wipes mud in it, so your milk is getting a bit of blood in it, if your farmhands don't spot it in the milking run.
None of these are things you want in your milk. Also, whether or not the milk is safe to drink, you still need to milk the cow, which still requires a milking machine (hopefully, if the cow hasn't hurt herself too badly) and while farmers do their best, a cowshed/milking run is not a sterile environment. The cows just piss and shit all over the run and your farmhands have to learn to dodge, or just put up with the fact that some splashback got in their hair for the rest of the day.
Everything that has been in a cowshed ideally needs to be pasteurised after. Up to and including the farmhands. Cows are massive, clumsy girls who don't know where their tits are, cause they can't see the fucking things. They cannot be trusted with hygiene, or food safe environments. They can barely be trusted with cow safe environments.
