Re-education. On those whom it does not work, the irredeemable: they will give their labor for the benefit of the people they lived their lives oppressing. Once a couple of generations have been raised with decent values, the whole world will change, permanently. We only need to do this once and it’s done forever. Then it’ll be 70-90% the other way around.

You need to read some utopian fiction. It’s a useful guide for how things can turn out.