Food is a necessity, but red meat is just one way to meet that necessity. There's a number of natural and synthetic substitutes that can accomplish the same goals (calories, protein, etc)
Clothing is a necessity, but fur is just one way to meet that necessity. There's a number of natural and synthetic substitutes that can accomplish the same goals (avoiding nudity when it would be considered immoral, staying warm in cold climates, etc)
What's the difference? Is fur just worse because it serves as a status symbol in addition to the practical purposes?
Maybe not relevant for mink vs cow farming, but in some situations I think killing animals for their fur is morally and environmentally superior to raising and killing animals for their meat. Louisiana nutria bounty program is a net positive for the native ecology, which I don't think could be said for most meat products.