1 is unnecessary and wasn’t present for most of history, 2 is a natural consequence of cattle being cattle, even without humans, but today we have both painkillers and bovine veterinarians, 3 is, again, not strictly necessary unless you’ve made the mistake of falling for the profit motive, and 4 is much more of a problem from a calves mouth parts than from a suitably gloved and balmed human hand.

Human beings can engage in subsistence-level dairy consumption without causing suffering beyond that already present in the reproduction cycle of cattle. They choose not to. I never said dairy farmers were or would choose to be moral, just that they aren’t required to be immoral by dairy production itself.