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"The objective of this review is to provide an integrated historical account of the complex, often convoluted events impacting milk hygiene and its resultant effect on infant mortality from 1875 to 1925. Heat pasteurization of cow's milk is necessary for rendering this important nutrient source safe for humans-particularly infants. Developed by Louis Pasteur in 1864, pasteurization evolved from the commercially important parboiling of wine and beer when the Industrial Revolution was effecting rapid societal change in Western societies. In European and American societies of the early and mid-19th century, infant mortality rates were 30- to 60-fold higher than the current rates of five or six deaths per 1,000 live births per year."

https://pubmed.ncbi.nlm.nih.gov/30234385/

Not every pre-pasteurization child died, but far more died than post-pasteurization.

Raw milk is just a bad idea at anything beyond incredibly tiny tightly controlled scale. Sure, you got lucky. It's still not a good way to feed a society.