The “from the neck up social stuff completely overrides biological stuff” is not true. Our social capacities are both enabled and constrained by our biology. Yes, we are the blankest slates in the biosphere but we are not blank slates. Our capacity to choose is the widest of all species, but one still sees patterns of behaviour which are clearly a result of our evolutionary heritage—the differences in cognitive and behavioural patterns between men and women, for example.
The “from the neck up social stuff completely overrides biological stuff” is not true. Our social capacities are both enabled and constrained by our biology. Yes, we are the blankest slates in the biosphere but we are not blank slates. Our capacity to choose is the widest of all species, but one still sees patterns of behaviour which are clearly a result of our evolutionary heritage—the differences in cognitive and behavioural patterns between men and women, for example.