It's a question that's reverberated through the ages – are we humans, though imperfect, essentially kind, sensible, good-natured creatures? Or deep down are we wired to be bad, blinkered, idle, vain, vengeful and selfish? There are no easy answers and there's clearly a lot of variation between individuals, but this feature post aims to shine some evidence-based light on the matter. Here in the first part of a two-part feature – and deliberately side-stepping the obviously relevant but controversial and already much-discussed Milgram, Zimbardo and Asch studies – we digest 10 dispiriting findings that reveal the darker and less impressive aspects of human nature:

We view minorities and the vulnerable as less than human
Through history humans have demonstrated a sickening willingness to inflict cruelty on one another. Part of the explanation may be that we have an unfortunate tendency to see certain groups – especially outsiders and vulnerable people perceived as low status – as being less than fully human. One striking example of this "blatant dehumanisation" came from a small brain-scan study that found students exhibited less neural activity associated with thinking about people when they looked at pictures of the homeless or of drug addicts, as compared with higher-status individuals. Many more studies have since demonstrated subtle forms of dehumanisation (in which we attribute fewer mental states to outsiders and minorities) and there have been further demonstrations of blatant dehumanisation – for instance, people who are opposed to Arab immigration or in favour of tougher counter-terrorism policy against Muslim extremists tended to rate Arabs and Muslims as literally less evolved than average. Among other examples, there's also evidence that young people dehumanise older people; and that men and women alike dehumanise drunk women.

What's more, the inclination to dehumanise starts early – children as young as five view out-group faces (those belonging to people who live in a different city or who are of a different gender than the child) as less human than in-group faces.

We already experience schadenfreude at the age of four
That last finding is particularly dispiriting since we often look to young children to give us hope for humankind – they are seen as the sweet and innocent ones who have yet to be corrupted by the grievances of adulthood. And yet many other studies show that very small kids are capable of some less-than-appealing adult-like emotions. For instance, a study from 2013 found that even four-year-olds seem to experience modest amounts of Schadenfreude – pleasure at another person's distress, especially if they perceived the person deserved it (because they'd engaged in a bad deed). A more recent study found that by age six children will pay to watch an antisocial puppet being hit, rather than spending the money on stickers. Oh, and maybe you should forget the idea of children offering you unconditional kindness – by age three, they are already keeping track of whether you are indebted to them.

We favour ineffective leaders with psychopathic traits

One way for us to mitigate against our human failings would be if we were inclined to choose leaders with rare virtuousness and skill. Sadly, we seem to have the opposite knack. Consider for a moment President Donald Trump. In seeking to explain his voter appeal, Dan McAdams, a professor of personality psychology, recently concluded that Trump's overt aggression and insults have a "primal appeal", and that his "incendiary tweets" are like the "charging displays" of an alpha male chimp, "designed to intimidate". Trump's supporters will disagree, but if McAdams' assessment is true it would fit into a wider pattern – the finding that psychopathic traits are more common than average among leaders. Take a survey of financial leaders in New York that found they scored highly on psychopathic traits but lower than average in emotional intelligence. In fairness, there have been some null and contradictory findings on this topic too, but a meta-analysis (an overview of prior evidence) published this summer concluded there is indeed a modest but significant link between trait psychopathy and leadership emergence, and that this has practical implications – especially since psychopathy also correlates with poorer leadership performance.

We are sexually attracted to people with dark personality traits
To worsen the situation, not only do we elect people with psychopathic traits to become our leaders, evidence suggests that men and women are sexually attracted, at least in the short-term, to people displaying the so-called "dark triad" of traits – narcissism, psychopathy and Machiavellianism – thus risking further propagating these traits. One study found women's physical attraction to a man was increased when he was described as having dark traits (as self-interested, manipulative and insensitive) compared with being described in the same way (in terms of his interests and so on), but with reference to the dark traits removed. One theory is that the dark traits successfully communicate "mate quality" in terms of confidence and the willingness to take risks. Does this matter for the future of our species? Perhaps it does – another paper, from 2016, found that those women who were more strongly attracted to narcissistic men's faces tended to have more children.

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Are we doomed? One comforting caveat – most of the dating research relevant to that last item was based on European American samples and may not generalise to other cultures (in fact a study out this year found that among Asian Americans, it was those men and women with more pro-social traits who were more successful at speed dating). But then again, there is a lot more depressing research that I could not fit into this article, such as the studies showing we're more motivated by envy than admiration, the shocking prevalence of lying (a habit we start at age two), and the manipulativeness of babies – they fake cry you know!

Don't get too down – these findings say nothing of the success some of our heroes, heroines and saints have had in overcoming their baser instincts. In fact, it is arguably by acknowledging and understanding our shortcomings that we can more successfully overcome them and so cultivate the better angels of our nature. On which note, remember to hang tight for the sequel to this post that will detail 10 findings showcasing the brighter, more uplifting aspects of humankind.

Christian Jarrett (@Psych_Writer) is Editor of BPS Research Digest

This article was originally published on BPS Research Digest. Read the original article.