'Sweet poison' and 'mild medicine': Different effects of collective narcissism and collective self-esteem on ingroup versus outgroup conspiracy beliefs.

Collective narcissism and non-narcissistic ingroup positivity (notably collective self-esteem) are associated differently with conspiracy beliefs. We conducted three cross-sectional surveys in China and the United States that distinguished between ingroup and outgroup conspiracy beliefs, to explore the intricate relationships and underlying mechanisms of these variables. Studies 1 (N = 800) and 2 (N = 385) showed that, in China, collective narcissism was positively associated with outgroup conspiracy belief (partially mediated by increased perceived threat from the outgroup) and with ingroup conspiracy belief (partially mediated by increased instrumental treatment of ingroup members); collective self-esteem was positively associated with outgroup conspiracy belief (fully mediated by increased victim consciousness), but negatively with ingroup conspiracy belief (fully mediated by increased system-justifying belief). Study 3 (N = 397) only replicated the significant positive relationship between collective narcissism and outgroup conspiracy belief in a US sample, and the partial mediating effect of increased perceived threat from the outgroup in it, while the other three paths were not statistically significant. These findings suggest that the association between different forms of ingroup positivity (narcissistic versus non-narcissistic) and conspiracy beliefs is influenced both by the identity of the conspirators (ingroup versus outgroup) and cultural context.