Yeah, well, you say you agree mostly, but then you switch again to the idealist vision: capitalism does this. My point is that neither capitalism, socialism nor communism does it and that the socio-economic structures today are all hybrids. I think we're pretty close in our views but that the biggest problem in our communication is the terminology. I state that the US is not a "pure" capitalist society, and neither are the European countries. The US may be closer to the original definition of "Capitalism" however.
The parrallel with Darwinism is a dangerous one, because, again the terminology is often not well understood and even abused. Still today some people think "survival of the fittest" just means that it's ok to root out the weak.
Where biological evolution is essentially about adaptation of a set of genes in order to survive, on a macro scale it is the adaptation of the "genes of society" in order for the world to survive, in other words adaptation of the rules. The two evolutions are not parrallel. Take procreation. Humans, like other animals have sexual strategies to give their genes maximal chances of replication. On the society level, another strategy might be applicable, for example the "one child policy" of the Chinese, which is much debated, but which allows the Chinese society (and most probably the world) to survive on the resources they have. But this is getting off topic, so I'll stop here.