My take on point #4 is this: Humans have plentiful incentives to keep breeding domesticated animals (whether for food, pets, or whatever). So we will try to ke

My take on point #4 is this: Humans have plentiful incentives to keep breeding domesticated animals (whether for food, pets, or whatever). So we will try to keep the population stable, and that helps prevent the extinction of these species (and accompanying loss of biodiversity). However, for undomesticated animals, the same incentives do not exist. We don't try to breed these animals, so the population is not as stable in the face of disasters like this (man-made or natural). The result is that undomesticated animals are more likely to face the threat of extinction (and accompanying loss of biodiversity). Just arguing against eating animals isn't sufficient. It would be beneficial to argue in favor of preserving biodiversity as well.