Here we are back in the realm of the ethical - but the ethical bleeds out into the political. The choice to press the button has a special force in the era of globalization and climate change. We know that our wealth and comfort are achieved at the price of others' suffering and exploitation, that our smallest actions contribute to ecological catastrophe, but the causal chains connecting our actions with their consequences are so complicated as to be unmappable - they lie far beyond not only our experience, and any possible experience. (Hence the inadequacy of folk politics.) What the Lewises are in effect asked to do is affirm their plugging into this causal matrix - to formally accept the world and worldliness. The significance of this is that only the negative choice counts - to not press the button would be to choose a freedom that is not available to anyone at present (we are all so intricately embedded into the global capitalist matrix that it isn't possible to simply opt out). But to press the button is to give up on freedom, to choose blind determinism.