If you caught your kid raising cats in tiny boxes, forcing them to live in their own feces without clean air or sunlight, pulling their teeth and claws out with pliers to keep them from hurting each other…you’d rush him to a psychiatrist. But you support that very behavior every time you buy meat, eggs, dairy or fur.
Inevitably anyone with an independent mind must become 'one who resists or opposes authority or established conventions': a rebel. If enough people come to agree with, and follow, the Rebel, we now have a Devil. Until, of course, still more people agree. And then, finally, we have --- Greatness.