Earlier quoted context omitted.
Which seems logical on the face of it. Calves drink fresh milk all the time, and they are mostly fine.
Yes, but that's udder to mouth. When humans milk cows, they use at the very least possibly dirty hands & pails, and if it's a modern dairy there's much more equipment along the way.
Not that I'm suggesting that raw milk is a good idea. I've drunk milk from the vat, and it is the cream content that gives it the different taste. But we invented civilisation for a reason.
And if someone is milking into a bucket, stay the fuck away from that stone age shit.