People say our intelligence permits us to use and harm animals. This belief pushes the fallacy that biological differences between two individuals can be used to justify discrimination and cruelty.
Citing our supposed superior intelligence while enslaving innocent beings is the most reprehensible act of willful discrimination. It is the cerebral equivalent of endorsing a strength-based society, where might makes right, and the man who can lift the largest stone defines the law.
All use is abuse. Listen carefully when you hear someone stating that we are justified in using those weaker, less privileged, and certainly listen carefully when the justification is that we are smarter, or have souls.
Those supposedly less intelligent, or those without souls, deserve our mercy even more.