 Eric Olsson and Sofi Angere have developed a sophisticated program in which the interaction of agents is modelled within a Bayesian network of both information and trust (Olsson 2011). Their program,  Laputa  (see Other Internet Resources) has a wide range of applications, one of which is a model of polarization interpreted in terms of the Persuasive Argument Theory in psychology and which replicates an effect seen in empirical studies: the increasing divergence of polarized groups (Lord, Ross, &amp; Lepper 1979; Isenberg 1986; Olsson 2013). Olsson raises the question of whether polarization may be epistemically rational, offering a positive answer. O’Connor and Weatherall (2018) and Singer et al. (2019) also argue that polarization can be rational, using different models and perhaps different senses of polarization (Bramson et al. 2017).