David was discovered trapped in a concrete box and once he escaped he was transported forward in time where Bishop resided. It was a dystopian future and David was immediately captured and put into slavery.
Everyone wants us to die, it's unanimous. They have the capability and the inclination. So why aren't we dead yet? We don't have the power that they do. We don't have autonomy. Our humanity is still disputed. We aren't alive because we fought hard enough, we're alive because they need us.
The X-Men are great metaphor for disability and the Inhumans are great metaphor for second generation disabled people, people who weren't born disabled but became disabled. The two groups are very similar but the X-Men got that way because of genetics and Inhumans got that way because of the physical act, entering the Terrigen mists.