Why not choose vegan ways?

Why limit compassion from any that really want to live? Being human should not be a prerequisite for being a subject of compassion. I understand defense is needed against biting pests, but animals being used are not that but defenseless beings in captivity, from the demand from any of us, who could choose differently, and have healthier ways with that, which I showed in my previous posts, while it does not demand as many resources and as much land and water with diminishing environments and contributing to loss of species.