Because even if it doesn't directly poison their air or burn them or detonate their basement or taint the local water tables, it will leave an anthropogenicly-diminished and apocalyptic wasteland of a world for them to inherit and for their lives to wither in while the people who did this, and presumably their children, build their arcologies with the sociopathically-stolen prosperity of The People's commonwealth and use it to secure a new aristocratic lordly power over this novel and bereft class of humanity now struggling to survive much less prosper. Behold, the new feudalistic dark age approaches and its architects roar in pathological laughter at the fate of their newly-minted serfs.