This kind of world gets built by some people who are excited to work towards this goal, but also by a much larger group of people for whom meeting their daily needs outweighs the abstract, distant drawbacks that they can pretend to rationalize away.

It will be built through economic coercion appealing to their livelihoods, and the impacts will be perceived as externalities. Incidentally, this is the same way most of the modern world got built over the last several centuries, with those having to work to earn their keep taking on various risks to enrich themselves ostensibly to provide for their families: mining, military service, or data mining others' personal information to sell ads; their participation in these has far-reaching impacts on the world, but gets distributed over a large population and avoids hitting close to home.

Some people can't rationalize this away, so (in a low-violence society) they quit and do something else. Given enough time, the workers who are uneasy will be replaced by people who have no such qualms. They, and their bosses, will make good money until an outraged public prompts government regulations to catch up. By that point, they will likely have a seat at the table. In an authoritarian society, or when the state itself is the actor, there's even less of a chance of this balance.