I think many vegans come at it from an animal rights point of view; hence no wool or honey. In the case of wool, the breeding, raising and shearing the sheep is considered unnatural activity, and in the case of shearing, stressful for the animal. Honey also confuses me, since you can take honey and preserve bee life without stressing the animals. With chickens, for every laying hen there is a male dead somewhere, which is unacceptable for vegans.
What many of the people who come from this perspective don't take into account is how animals have been changed by selective breeding. A modern wool sheep, left unsheared, and in a natural state will likely end up miserable and possibly infected from all the crap that ends up in wool that the sheep was bred to have removed annually. Silk worms, which are killed in most silk production, are incapable of living independent of humans. They can't even fly. Many in the far extremes of the animal rights movement feel that it would be better for the species to go extinct, rather than live solely for the exploitation of humanity. For some of our domestic animals there are no wild versions; they are long since extinct. But this matters little to those who are at the far edges of the animal rights movement.
What many of the people who come from this perspective don't take into account is how animals have been changed by selective breeding. A modern wool sheep, left unsheared, and in a natural state will likely end up miserable and possibly infected from all the crap that ends up in wool that the sheep was bred to have removed annually. Silk worms, which are killed in most silk production, are incapable of living independent of humans. They can't even fly. Many in the far extremes of the animal rights movement feel that it would be better for the species to go extinct, rather than live solely for the exploitation of humanity. For some of our domestic animals there are no wild versions; they are long since extinct. But this matters little to those who are at the far edges of the animal rights movement.