Most people in the past rarely drank milk. Dairy was for making cheese, since that could be preserved.
If they did drink dairy, it was mostly in the form of fermented (modified!) products like buttermilk, kefir, fillmjölk, etc.
Chuck Groenink
Humans never actually needed to modify our foods, we drank milk without pasteurizing from a variety of animals for thousands of years. The food systems we have now, all created by evil elite powers that be, are complex & non-sensical enough to cause arguments re something as simple as drinking milk.