There's no way to sugarcoat it: in order to extract milk you must r--- the cow and then kill its baby, then if you don't milk them, they die.
The treatment of animals is so bad that b-------ty laws have literally failed to pass because they would have criminalized the whole industry, and that's not even to mention the times when people who call out overt, malicious abuse suffer more consequences than the ones doing it.
Basically; the sooner we shut the system down the better. It's unsustainable and only being held together by subsidies anyway.