I disagree with the idea that veganism is "about animals."
My veganism is about me, and about other humans.
I do it not so much because I care about animals, but because I care about me and other people. I don't want to be a person who kills animals unnecessarily, especially when an entirely plant-based food is no harder for a population of people to subsist on, than a mixed diet containing some animal-based food. I think the idea of killing and eating animals, or raising them and using their milk, is esthetically repellant. It is really all about me, my view of myself, and my view of want kind of life I want to have. I don't want to live the life of an animal-slaughterer and eater. I want to live a more pleasant, and less bloody, less violent life, and do so among other people who also try to live a less bloody, less violent life. It is simply -- more pleasant for me that way, and more pleasant for the other people, too. Not because I like animals so much, but because violence is ugly. It is pleasanter, for me, to live without killing and eating animals, than to be immersed in killing and eating them. And I think it would be pleasanter for other too, if they stopped practicing such unnecessary violence.
Being that all vertebrates look astonishingly similar when you cut them up into little pieces, violence toward animals looks astonishingly similar to violence against humans, and to violence against me -- and this kind of violence is really atrocious. I care about my physical integrety and that of other humans, more than I care about that of animals. I care about people very much. But since violence toward animals looks so much like violence against people, I don't want to see violence against animals either, any more than I want to see violence against people. It strikes the same chord inside me.
My veganism is all about me, and my relationship to other humans. I want the choir of humanity to sing a more pleasant cord, and not linger on a chord that is grating, and unpleasant.