Imagine an issue becomes salient in a society with the potential to drive the society apart in different subgroups. It is likely that the social structure of the society will have an effect through processes of influence and selection on how problematic the choices people make related to this issue will be for the society. Two types of potential problems might arise: (a) the extent to which actors get stuck in a suboptimal situation and do not reach a Pareto best outcome; (b) the extent to which the society is divided in parts that do not reach consensus, which possibly is a ground for violent conflict. The simulations in this paper show that if a society is already rather segregated from the beginning, the probability that segregation is aggravated by influence or selection is large. The effect of network density is multifold. First, density has a positive effect on reaching a uniform opinion. In addition, density increases the likelihood that actors do not change their behavior in the process leading to more inefficiency the less efficient the initial situation is.