Violence is "the answer" in about four generations of continual oppression if trends continue. That's historically how long it usually takes for an oppressed group to get sick of their oppressors. You need people who not only know nothing but oppression and hate, but whose entirety of living memory is oppression and hate. A willing slave is willing. Their children may resent it, but will be tempered by that upbringing. Their children in turn will have stories of the rose-colored nostalgia of their grandparents of the few "good" jailors and slavers, and want to assess the impact of each person. Only one more generation beyond that would be able to dehumanize enough, untrained, to kill enough. Otherwise a like-minded and/or like-blooded just takes over.
So assuming humans don't manage to collectively swallow tide pods, 2100 with a continuous increasing oppression trend is about when the answer is violence.
Is violence the answer yet?
No, academically speaking.
Violence is "the answer" in about four generations of continual oppression if trends continue. That's historically how long it usually takes for an oppressed group to get sick of their oppressors. You need people who not only know nothing but oppression and hate, but whose entirety of living memory is oppression and hate. A willing slave is willing. Their children may resent it, but will be tempered by that upbringing. Their children in turn will have stories of the rose-colored nostalgia of their grandparents of the few "good" jailors and slavers, and want to assess the impact of each person. Only one more generation beyond that would be able to dehumanize enough, untrained, to kill enough. Otherwise a like-minded and/or like-blooded just takes over.
So assuming humans don't manage to collectively swallow tide pods, 2100 with a continuous increasing oppression trend is about when the answer is violence.