Capitalism, Socialism, Evolutionism

Social Darwinism is an example of how Capitalists have been quicker than Socialists to incorporate Evolutionist elements.  It derives from Darwin's thesis that Variation has Evolutionary value as a process of determining superior types, with Egoism as a modification of Variation, i. e. via the interpretation of Variation as Individuation.  However, Darwin misses a different Evolutionary virtue of Variation--the promotion of Versatility, which strengthens a species.  So, that strength requires the maintaining of cohesion amongst the varieties, which modification to Egoism undermines, as Smith himself briefly recognizes when expressing worries about the tendency of his system towards social fragmentation.  Thus, there is an opportunity for Marxists to argue that a more cohesive society is a stronger society, and as a remedy for divisive Class Conflict, Socialism is more cohesive than Capitalism.  Likewise, they can argue more generally that a theory concerning the Biological success of a mutable Species has more in common with a doctrine that promotes historically variable Collectivism, than with a doctrine that promotes the individual pursuit of Wealth.