It gets very frustrating to see the role of biology in human 
behavior being eschewed for nonsense when the evidence is present right 
before your very eyes. You see this blank slate argument coming from 
every side of the coin. From the feminist on the left to the 
Objectivists on the right. I want to point out that all animals have 
natures something that Objectivism itself points out. I also want to 
point out that all animals have a biological disposition. The idea that 
we are separate from nature in this way is silly at best and ludicrous 
at worst. It is unscientific to claim that biology and evolution ends at
 the neck and does not extend into the brain and human mind. 
From the left you have the people that want a new Marxist man and 
also the feminist types. They both want to use social engineering to 
alter human nature due to not believing that humans have one. This is a 
sickening view that totally devalues human life and makes me want to 
vomit to be honest. Men should be able to break with masculinity because
 "testosterone don't do nothing." There is no biology to men being men. 
To men being masculine and tending to be certain ways with others and 
themselves. It is all nurture and nature plays no part in men being whom
 and what they are. It is sick and twisted to be sure. 
However, how are SOME Right Objectivists any better when they 
believe that free will is so absolute that we have no innate tendencies?
 We have no innate functions, emotions, views, predilections for this or
 that. That evolution does indeed stop at the neck and there is no 
innateness to the human. That we are all a blank slate if you will and 
have no human nature. Despite Objectivism saying we have one and must 
live by that nature. That man is qua man and cannot be anything, but, 
man qua man. Which means that if there is even a little bit of biology 
to anything it must be acknowledged and worked with in this framework. 
Evolution is real and biology is real it can be 
seen/studied/understood. How can it be that our biology not be a factor 
in the midst of our lives and choices? Of course it is and it is in the 
center of everything from mate selection to why we love Fast and fatty 
foods. The idea that we have no innateness is insane. The idea that we 
do not have evolved traits which helped to make our species survive and 
thus still survive even if buried deep is insane. I say to THESE 
Objectivists you are acting like cultists denying reality as opposed to 
letting reality be the final arbiter which is part of Objectivism 
itself. 
I have as much of an issue with those MRA's whom deny evolutionary 
reasons for various things they like to blame on other things like 
society. For example; it is not society that deems men to be in the most
 dangerous of jobs it is the biological differences between the sexes. 
Women could not and cannot still often times work some of the most 
deadliest jobs as well as men. Why? Do to their nature mainly pregnancy 
worries, but, also the differences in strength. The average "feminine" 
women and the average "masculine" man are just different in many regards
 to upper body strength it cannot be denied. So, jobs where lifting for 
example takes place will be mostly men. Construction will be mostly men 
and so forth. 
You will never get women taking over all the dangerous jobs; sorry,
 but, this is one of those Nature being a Tyrant things we will never 
escape. Most women just have different preferences than men. Which means
 that MRA's whom preach that everything is some Gynocentric Societal 
Construction are just as inane and loony as the feminists that preach 
about some Patriarchal Societal Construction against women. I have said 
it before and will say it again Gender Roles are the domain of nature 
the Tyrant and not absolute free willed choice. Unless you rewire women 
and men's natures we will never have "egalitarianism." The idea is 
against the very biology that makes our species survive and is an 
affront to Nature.    
All we can do is protect all individuals right to pursue their own 
happiness irregardless of if it is determined or absolutely free. By 
doing this one can act from nature, nurture or both and be safe in 
acting. Be safe in being whom and what they are. Be safe in being left 
alone instead of being a sacrifice to their neighbors needs and desires.
 This is what is required; the fire for the engine does not matter, but,
 to have a just society the engine needs to be able to run like 
clockwork. The fuel for that engine is irrelevant as long as it is not 
forced from others and is done via rational and voluntary means. The 
FACT that biology is a driver of many of our human actions does not 
alter what is moral or practical it all remains the same.