The most popular take among vegans (and this is coming from a vegan myself) is that breeding animals is awful, but adopting an animal from a shelter is great.
There’s a lot of reasons that vegans are not fans of pet ownership, mostly because there are very minimal regulations in place regarding their treatment. I’m sure everyone knows someone who doesn’t treat their pet well.
However, once an animal is born into this world, it already exists, and there’s only two options. Either we can care for it, or let it die.
That’s why vegans are okay with adopting pets but not with buying animals from mills. Buying animals from mills incentives the breeders to make more, taking them from shelters doesn’t profit / incentivize anyone. Let’s stop making more animals but take care of the ones that already exist.
To be fair, the word butter is very vague. Shea butter has no milk, apple butter has no milk, etc.