You’re focusing on one aspect of dairy farming when there are a number of ethically unsound practices such as stealing the babies from their mothers and killing them for beef, even if not veal. Or artificially inseminating mothers and forcefully impregnating them, selectively breeding them to overproduce milk which wrecks their bodies. And then killing them at the end of a life of extreme suffering, still at a relatively young age. It doesn’t make a difference to the fact that they’re cruel, and necessary parts of large scale dairy farming, which is unnecessary as a whole.