Well, if you take the time to learn about dairy farming (even in free range dairy farms), you would quickly find out that cows have a natural lifespan of ~20 years, but cows used in dairy farms have an average lifespan of ~6 years. From the perspective of giving entities that we believe are probably conscious and probably feel suffering and pain a fair chance at life, minimizing the amount of dairy and cheese we consume would seem like a good idea. I'm looking forward to a world where lab-grown cheese substitutes are as good as (or better) than the real thing.