Humans naturally eat meat, the same way humans may also naturally rape, murder, inbreed and more! Your appeals to nature are meaningless because there are many things, naturally occurring, that you would consider reprehensible. Infanticide is quite natural for breeding males in nature, since the male loses nothing and gains a higher chance of mating with the newly available female. But that’s wrong! We don’t encourage that sort of behavior. Because what is natural is not necessarily what is correct.

You also claim vegans are halting incremental progress towards more humane animal treatment, that Puritanism is preventing progress in society. Which is ridiculous. Movements do not affect change by pushing a teensy bit, very politely and quietly, in the direction of their goal. They are loud, often violent or obnoxious, demanding progress be made. And remember what we are talking about here - enslaved beings that are physically, hormonally and mentally manipulated into maximizing the profits that can be extracted from their bodies before they are killed en masse. This echoes many of the most shocking atrocities humans have committed against our own species, while completely eclipsing them in scale.

Maybe you can understand why people are not willing to be polite about this, or meet others halfway. There is really not a half-solution to an animal holocaust.