I do not disagree with what you wrote, but I don't see a single argument to why it's not something you just as well could have learned thru your upbringing as something that lies within the genes of your forefather.
I see racism as a learned behavior and not a natural instinct.
"In a paper that will be published in the Journal of Cognitive Neuroscience, Eva Telzer of UCLA and three other researchers report that they’ve performed these amygdala studies—which had previously been done on adults—on children. And they found something interesting: the racial sensitivity of the amygdala doesn’t kick in until around age 14."
and
"I’m not a blank slater; I don’t believe that we’re born innocent, and only develop a dark side after bad tendencies are engrained by evil capitalists, or evil patriarchs, or evil warmongers, or evil whatevers. I think that, though we’re not naturally racist, we’re naturally “groupist.” Evolution seems to have inclined us to readily define whole groups of people as the enemy, after which we can find their suffering, even death, very easy to countenance and even facilitate."
and
"It’s in this sense that race is a “social construct.” It’s not a category that’s inherently correlated with our patterns of fear or mistrust or hatred, though, obviously, it can become one. So it’s within our power to construct a society in which race isn’t a meaningful construct."
from
http://www.amren.com/news/2012/10/new-evidence-that-racism-isnt-natural/
The above pretty much describes my view on racism.
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