It commodifies animal life. Many vegans choose not to consume animal products due to this. Its the idea of using an animal for consumption. Even eggs and honey which don’t require murdering the animal - its turning an animals life into just a commodity
Backyard chickens are bred to produce eggs faster than their bodies can naturally handle, leading to health problems and a much shorter lifespan. When they stop laying eggs, they’re almost always sent to slaughter because people don’t want to take care of a sick chicken for years. They have to be purchased from meat companies in the first place, essentially supporting them.
Animals don’t care if you or some worker slits their throat. There is no humane way to take the life of someone who doesn’t want to be killed, and again, those animals have to be purchased from meat companies in the first place.
Besides, it’s way easier to cook fucking delicious vegan food than to kill an animal you’ve grown attached to.