It is fascinating to discover that individuals who are asked to assign a punishment to a criminal are influenced by factors that they are unaware of (like the presence of a flag in the room) or that they would consciously diavow (like the color of the criminal's skin). It is boring to find that individuals' proposed punishments are influenced by rational considerations such as the severity of the crime and the criminal's previous record. Interesting: we are more willing to help someonw if there is the smell of fresh bread in the air. Boring: we are more willing to help someone if he or she has been kind to us in the past. We sometimes forget that this bias in publication exists and take what is reported in scientific journals and the popular press as an accurate reflection of our best science of how the mind works. But this is like watching the nightly news and concluding that rape, robbery, and murder are part of any individual's everyday life - forgetting that the nightly news doesn't report the vast majority of cases where nothing of this sort happens at all.
It might feel, at least to some of us, that our opinions about issues such as abortion and the death penalty are the products of careful deliberation and that our specific moral acts, such as deciding to give to charity or visit a friend in the hospital—or for that matter, deciding to shoplift or shout a racist insult out of a car window—are grounded in conscious decision-making. But this is said to be mistaken. As Jonathan Haidt argues, we are not judges; we are lawyers, making up explanations after the deeds have been done. Reason is impotent. "We celebrate rationality," agrees de Waal, "but when push comes to shove we assign it little weight.
Some very common foods and drinks are aversive. Few people enjoy, at first, coffee, beer, tobacco, or chili pepper. Pleasure from pain is uniquely human. No other animal willingly eats such foods when there are alternatives. Philosophers have often looked for the defining feature of humans—language, rationality, culture, and so on. I'd stick with this: Man is the only animal that likes Tabasco sauce.