I can tell you that there exist environments which are not cut-throat and that are cooperative. Rational individuals understand immediately that cooperation gi

I can tell you that there exist environments which are not cut-throat and that are cooperative. Rational individuals understand immediately that cooperation gives more return than its opposite. If you show to be an asset, you are everybody's asset. Sure, there is an epidemic of irrationality - but it did not hit every environment, and there exist cultures which had that idea of cooperation permeated societally. (Especially as the whole point of "society" is cooperation.)