TIL about "Swill milk" where cows were fed distillery waste causing cow teeth rot and disease. It was also adulterated with raw eggs, burn sugar, etc. Swill milk lead to over 8,000 infant's deaths

This is exactly what deregulation leads to. People seem to forget that regulations have a reason, just like vaccines have a reason. Granted some regulations are heavy handed or just overbearing, but then tweak them.. don't remove regulations because we never had someone do what it was designed to prevent.

libertarians internally raging

While the adulteration surely didn't help, I don't think I'd trust pure milk from these cows, either:

Swill milk dairies were noted for their filthy conditions and overpowering stench both caused by the close confinement of hundreds (sometimes thousands) of cows in narrow stalls where, once they were tied, they would stay for the rest of their lives, often standing in their own manure, covered with flies and sores, and suffering from a range of virulent diseases. These cows were fed boiling distillery waste, often leaving the cows with rotting teeth and other maladies.

Probably most, although the disease likely didn't help.

There's a behind the bastards episode on this, formaldehyde was a popular additive to improve shelf life, as were several other horrible things. Most of the other additives were used to restore color, flavor, and texture after the milk had been diluted so heavily with water.

Sorry, but they still aren't treated well.

Jesus Christ. It's $2.19 here...

On the contrary, milk should be even more expensive. The only reason it isn't is because of a huge network of government subsidies at nearly every step.