I think we can keep it going for a while, as you say, by continuously absorbing defectors from more fertile populations. But I think if you admit to any genetic component to this at all, there will definitely be genetic flow, with the more fertile populations eventually taking over.
Being "reasonable" and "planning" are just extremely maladaptive in the current world. For example, reproduction in this population is completely dwarfing reproduction of highly educated, self-controlled, non-criminal groups: http://www.amazon.com/Promises-Can-Keep-Motherhood-Marriage/...
Being "reasonable" and "planning" are just extremely maladaptive in the current world. For example, reproduction in this population is completely dwarfing reproduction of highly educated, self-controlled, non-criminal groups: http://www.amazon.com/Promises-Can-Keep-Motherhood-Marriage/...