People who say drinking milk is cruel when not milking a cow actually causes them pain
I’m going out on an ex-vegan current lacto-ovo pescetarian (thank you sorasusi for the correction) with a bad conscience limb here. You do know what causes lactation? Giving birth. Even cows do not lactate just for the hell of it. Dairy cattle are bred at 12-14 month intervals for maximum milk production and separated from the calf usually within a day from calving to prevent the forming of a parental bond. Saying drinking milk is merciful because not milking a lactating cow causes her pain (which is true in itself) is, frankly, bullshit because in the large-scale dairy industry the pregnancy is achieved through artificial insemination (thus 100% premeditated and preventable) and even after the fact, the calf would do the job just fine if allowed.
Further, dairy consumption has been shown to have little to no positive effect on bone integrity (what you need calcium for) and can in fact contribute to a host of health problems. Sufficient calcium intake, around 1000-1300 mg a day depending on sex and age, is easily attained even without dairy. Here is a list of foods in descending order of highest to lowest amount of calcium per 100 grams. You will notice that cow’s milk is nowhere near the top and is packed with cholesterol. I’m not even touching the animal welfare and environmental issues here.