Colin Mcginn's Arguments For Animal Rights

One of Colin McGinn’s arguments for animal rights is a story of shumans. In his argument he talks of a civilization of vampires who live on human blood simply because the blood taste better than the alternative. The point of the story was make the reader see that eating animals is wrong because we have other options. He calls this speciesism and says that all living things that can feel pain should have a right to live freely. To a point I agree with his views, animals should be treated with respect and care. However, animals are and will remain a food source for us, this is not going to change.
What needs to change is the way our food is kept, we should not buy meat from slaughter farms were cows are horribly mistreated, or chickens from