Most people would object to breeding brainless human babies for the pot, even though by definition brainless human babies are not people, cannot feel or suffer, and can be treated as objects because they are objects.

This is not because breeding brainless human babies would be wrong. It's because our species has an instinctive aversion to cannibalism and an instinctive tendency to treat anything with baby-like physical features as people (which also accounts for the many anti-abortion arguments that depend on the physical attributes of the fetus).