Why are vitamins added to commercial pasteurized organic milk?

vitamins added to commercial pasteurized organic milk because commercial dairy farms raise cows inside buildings (many chained down all their life), thus not getting any fresh air or sunshine, and given grains to eat (not grass), all of which results in their milk being inferior quality not containing many vitamins found in raw milk. In addition, the pasteurization process denatures fragile milk proteins, destroys enzymes, destroys vitamins C, B6, and B12, beneficial bacteria, promotes pathogens. Consumption of pasteurized milk is associated with allergies, asthma, skin problems, arthritis, growth problems in children, and osteoporosis to name a few.