Bit chin Society Emissary

And it clicked for me. He was a missionary—one of those fringe-dwellers who act as emissary from the Bitchun Society to the benighted corners of the world where, for whatever reasons, they want to die, starve, and choke on petrochem waste. It's amazing that these communities survive more than a generation; in the Bitchun Society proper, we usually outlive our detractors. The missionaries don't have such a high success rate—you have to be awfully convincing to get through to a culture that's already successfully resisted nearly a century's worth of propaganda—but when you convert a whole village, you accrue all the Whuffie they have to give. More often, missionaries end up getting refreshed from a backup after they aren't heard from for a decade or so. I'd never met one in the flesh before.

[...]

He spun a fascinating yarn then, how he slowly gained the acceptance of the mountain-dwellers, and then their trust, and then betrayed it in subtle, beneficent ways: introducing Free Energy to their greenhouses, then a gengineered crop or two, then curing a couple deaths, slowly inching them toward the Bitchun Society, until they couldn't remember why they hadn't wanted to be a part of it from the start. Now they were mostly off-world, exploring toy frontiers with unlimited energy and unlimited supplies and deadheading through the dull times en route.