 Greene takes this to support the hypothesis that what accounts for people’s different moral responses to Trolley and Bridge (and countless other cases) is simply the difference in emotional response, which in turn ties in to evolutionary explanations. Given the need in our evolutionary past for mechanisms to restrain interpersonal violence within cooperating groups, “it should come as no surprise if we have innate responses to personal violence that are powerful but rather primitive,” predating the evolution of complex reasoning and now competing with our more reasoned responses (Greene 2008, 43). Deontological intuitions, such as our condemnation of the violence in Bridge, thus represent evolved “alarm-like emotional responses” which are subsequently rationalized rather than resulting from moral reasoning (see the discussion of Haidt in section 2.5); by contrast, our responses to more abstract harm such as Trolley reflect complex cognitive processes, as do consequentialist responses generally, including cases where people overcome their initial negative emotional responses (in cases like Bridge) and decide that the right thing to do is whatever produces the best overall consequences.