As we are seeing in real time in both Europe and the USA, ethnocentrism trumps humanitarianism the vast majority of the time:

In this study, we examine the possible temporal coincidence between population saturation and the establishment of ethnocentric dominance. Both the mediation and direct hypotheses predict a close temporal coincidence between population saturation and ethnocentric dominance. Both hypotheses also predict that the frequency of humanitarian agents decreases with ethnocentric growth, though the direct hypothesis predicts a direct relation not using the mediating influence of free-riders.Translation: the West has severely endangered itself by exchanging nationalism (ethnocentrism) for globalism (humanitarianism), and can only recover by abandoning the latter.

Method

Our methodology is the same as in the original simulation (Hammond & Axelrod 2006b), except that we record strategy frequencies at every evolutionary cycle in 50 worlds and stop at 1000 cycles because solutions are always stable by then. We record results at every evolutionary cycle to provide a more complete picture of evolutionary processes and insights into the determinants of stable evolutionary outcomes.

To examine the unique predictions of each hypothesis, we perform a mediation analysis to determine whether the relation between ethnocentric and humanitarian strategies is mediated by suppression of selfish strategies. The direct hypothesis would be uniquely supported by finding an unmediated negative relation between ethnocentrism and humanitarianism, while the mediation hypothesis would be uniquely supported by finding evidence of such mediation through selfish free-riders.

Results

Mean evolving strategy frequencies over the 50 worlds are plotted in Figure 1. These plots indicate that ethnocentric dominance occurs, on average, at around 300 evolutionary cycles. Until that point, there is strong competition from humanitarians. Both selfish and traitorous strategies increase over the first 300 cycles but then stagnate at such low levels that they never pose much of a threat to either humanitarianism or ethnocentrism. A plot of evolving population sizes in 50 worlds, in Figure 2 left-side Y-axis, indicates that world population saturates at around that same time, 300 cycles. The right-side Y-axis in Figure 2 shows that the proportion of out-group interactions, averaged over 50 worlds in a fresh simulation, increases across the first 300 evolutionary cycles and then stagnates at just under .2. Proportion of out-group interactions is computed as the number of out-group interactions divided by number of total interactions (out-group interactions + in-group interactions). In summary, as the world fills up, out-group interactions reach a maximum and final decisive splits in strategy frequencies emerge. Similar to earlier results (Hammond & Axelrod 2006b), the mean proportions of strategies at 1000 cycles are .08 selfish, .02 traitorous, .73 ethnocentric, and .17 humanitarian.