People just started heating milk for fun I guess. Like I don't know how to explain to someone that you are just heating milk up and then cooling it. That's all pasteurization is. Why not just fucking eat raw meat and eggs while you're at it, humans did that for thousands of years too.
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.