Those things exist, sure. But none of them actually make slavery immoral.
Consequences - I lose all that low cost labor, I’ll have to work harder myself.. no thanks, I’ll keep my slaves. Consequences say I should keep them.
Empathy - I certainly empathize with my slaves. I keep them fed & sheltered, protect them from enemies, and only beat them when necessary. Empathy doesn’t force me to not have slaves.
Sense of community - there’s a strong sense of community among all us upper class slave owners. And there’s a strong sense of community among all the slaves. Sense of community doesn’t force me to free them.
Cooperation - my slaves and I are constantly working toward the same goals. Cooperation doesn’t compel me to free them.
Culture - here’s the 10 longest lasting cultures in history:
10 Most Long-lived Empires in History
… they all had slavery. Culture didn’t compel them to free the slaves.
Upbringing - as long as I teach my kids that having slaves is morally good, then having slaves is still morally good.
Homeostasis - as long as slavery promotes a stable society (which again is shown by the fact that the 10 longest lasting societies had slaves), slavery is still moral.
Fear of loneliness - my slaves keep me company, so it’s moral to keep them.
Human existence is necessary? Ok. Well, once again, the most successful societies all had slavery. You can’t have a successful society without successful human existence, so the most successful human existences have all had slavery as part of their cultures.