Why must I explain cow maintenence in India when all i wanted to know was why vegans dont consume dairy?

If you'll humor me, I'm walking you through a few of the reasons.

Its a yearly thing, baby is born, baby stays for 5 or so months, then when they are good on grass, they are either sent off to another cow keeper, farmer if ox or kept

As you describe, typically, the calves are separated from their mother, whose excess milk is then harvested and consumed by humans like you. The male calves are culled, eaten, or (rarely) used for breeding. This alone is fundamentally exploitative and vegans like me believe supporting it is morally reprehensible. But if that isn't sufficiently questionable for your scruples, in order to produce the separated calf (and stimulate milk production), the dairy cows are regularly forcibly inseminated. When they are no longer productive, they are culled and their carcasses are deconstructed and sold for as much profit as possible. Obviously cows cannot consent to any of this.

s it that hard to comprehend cows living peacefully in a country that considers them sacred

If that country allows the proliferation of an industry that profits from the extraction of products oftheir bodies, yes.

In addition, cows have to be tricked into letting their milk down to be collected by humans. Without their calf present they'll hold their milk and nothing comes out.

In short, it's theft.