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So some of the time an intellectual challenge is to assimilate how similar we can be to others species. In other cases the challenge is to appreciate how, though human physiology resembles that of other species, we use the physiology in novel ways. We activate the classical physiology of vigilance while watching a scary movie. We activate a stress response when thinking about mortality. We secrete hormones related to nurturing and social bonding, but in response to an adorable baby panda. And this certainly applies to aggression - we use the same muscles as does a male chimp attacking a sexual competitor, but we use them to harm someone because of their ideology.