You're the delusional one. You're saying that they're non sentient, and that they're not even 'others' are they just items to you? Things to be used and abused?
Lions enjoy the kill. It's their fun- the chase, the excitement, et.c. I don't pretend to understand, but those lions in zoos really sulk.
So we are now intelligent enough to understand the suffering of others, and to lessen our impact on their pain. And I don't think lions would factory farm zebras- it would cause them to die of boredom, maybe the weak or old ones would, though... so they'd de-evolve, like us, into weak lemons, playing 'catch the zebra' computer games and painting their claws.
I study animal communication, and I see sentience. I work with a mini-herd of horses- and I can understand their body language as I can speak english. It is wrong to presume they are stupid because they do not speak our language and do not look like us- that's the same morals that founded the slave trade.