Raw milk is not contaminated with bacteria...just like human breast milk isn't. It's bacteria that enter from the teat that cause the problem. So a human baby feeding from breast does not require milk pasteurisation as it will likely have it's mother's skin flora anyway. I however would not like to take the risk that Joe Bloggs dairy farmer up the road with his grotty sanitation (or no sanitation) would be allowed to contaminate the WHOLE milk truck full of milk, and then drink that unpasteurised. Can you imagine the amount of bacterial replication that would occur enroute to the factory and through the bottling process? If you would like to drink the milk produced by your own cow, with sanitation standards you enforced personally, go right on ahead. (and I probably would be happy to do that, as I would be the person taking the risk). Could I live with myself if I caused a pregnant mum to get Listeriosis...well no, I couldn't.