The actually history of pasteurization had nothing to do with making milk from normal dairy farms safe. Pasteurization was a response to the urban industrialization of milk production. That is, pasteurization was only a response a very specific milk - industrial milk.
The War of 1812 with England resulted in the permanent cutting off of the whiskey supply America procured from the British West Indies. As a result, the domestic liquor industry was born, and by 1814, grain distilleries began to spring up in the cities as well as the country. Distillery owners then began housing cows next to the distilleries and feeding hot slop, the waste product of whiskey making, directly to the animals as it poured off the stills. Thus was born the slop or swill milk system.
Slop is of little value in fattening cattle; it is unnatural food for them, and makes them diseased and emaciated. But when slop was plentifully supplied, cows yielded an abundance of milk. Diseased cows were milked in an unsanitary manner. The individuals doing the milking were often dirty, sick or both. Milk pails and other equipment were usually dirty. Such milk sometimes led to disease. ...
This is an excellent article about the history of pasteurization and it's "scientific" misuse today.
Also, I loved this quote:
"Advertising may be described as the science of arresting the human intelligence long enough to get money from it."– Stephen Leacock