Oda is just a coward when it comes to garp.
History is full of people who hated their boss and still followed their orders. No need to justify it (but hey, he really hates his boss, lol).
It took us more than four thousand years to cancel slavery (though it still exists in other part of the world), despite having numerous intelligent religious philosophers throughout history.( I bet money is a huge reason too kek)
Are all born born equal?
Are all human valuable?
If the Celestial Dragons are considered gods in this world, then why is slavery seen as wrong? Does Nika have some kind of book that says humans are made in the image of God and should be laughing, loving, and all that shit? No, right? So where does the idea that slavery is wrong even come from in the One Piece world?
Did the human race evolve from a rock? So why the moralfagging for garp? Why do we need a pirate to justify him, when the world itself should lead to that conclusion.

Why doesn't the world government have an official religion or something? It human worship one oh one.
Nikka might want to dance for freedom, but not everyone desires that freedom, hence the Devil Fruit.
What I was trying to say is that Garp hating on his boss should be something only he knows; we don't need a pirate to confirm it just to make you feel good, Oda.

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