O_O are people mistaking race with species? We are the human species, there is no such thing as the human race.
Orcs and draenei arent different races, they are different species. Blood elves and high elves are different races of the same species.
Depends on how you define race, personally I dont see any purpose in the social correctiveness in saying that there are no human races. If we assign race to an animal, say a dog, due to variation in coloration of their fur, there is absolutely no reason why we shouldn't apply the same to humans.
Saying that all humans are alike and that there are no biological differences is also incorrect.
While we all have a common ancestor, there are different mixes from our ancestor hominods, say cro magnon, neanderthal and denisovan.
Our physiology is also slightly different, while you can encounter the entire range of human variation inside a single race in terms of physical attributes, the truth is that each "race" tends towards an area and its majority will have specific characteristics.
There are other differences, mixed race kids have higher chance if being stillborn, have more health issues (and you thought they would have less didnt you? im mixed race, i know sadly), for example have fun finding donors (organs/bone marrow) for mixed race kids. Higher rates of depression and so forth.
Different races also react differently to medicine, a specific medicine that works wonders in a white population wont work that great in a black population, even within ethnicities (sub-divisions of race) can have differences, for example middle easterners are Caucasian, but a different ethnicity of Caucasian, just as Nordics are a different ethnicity of Caucasian from Mediterraneans.
Each race/ethnicity will also carry different genetic markers, which can be used to identify the persons ethnicity and race, they also have unique diseases, say sickle cell anemia in African descendants, an evolutionary adaptation to Malaria.
Our skins are different due to different exposures to light (or lack of) as we evolved, but that is enough to make that a Black person moving to northern areas will have higher rate of depression, violence, etc , and a white person moving to southern areas, higher rate of skin cancer, eyesight issues, lethargy, etc (in a global scale)
Certain genes are more present in specific races, say the Warrior Gene, so called because it creates different reactions to stress for those who have it and those who dont have it.
You can identify someones race based on their bones, you can identify someones race based on their musculature, hormonal profile, hair and so forth.
One can go on and on and on about this, humans can be distinguished as races, this is not a social construct, this is a biological reality and to ignore this because there have been really shit studies in the past mired in biases and racism, it also creates a lot of issues, social issues, identity issues and most important, medical issues, as we pretend there are no differences so we pretend that a medication tested in a majority homogeneous population will work in everyone, or we throw away a really good medicine that happens to only work in say, black people, because on average it has low efficiency because the test subject group was highly diverse.
Hell, humans even have different smells based on race, babies can discern race (although they wont have prejudice, as those are social influences).
So I dont know... i think that trying to be politically correct causes more harm than good, it creates false myths, it prevents real science and real research, because people are afraid of specific areas of difference and how it can be used to excuse really bad ideas (eugenics, genocide etc).
Then on top of races, you have cultural memes, your culture could be compared to an OS, it defines all your subroutines, how you react to a specific situation, how to behave in specific areas, towards specific people, what is right, what is wrong, what is adequate punishment/consequence, what is causative of such punishment/consequence... it gets complicated, complex, and people turn a blind eye to this, politicians especially afraid to lose popularity because the population is busy pretending everyone is the same, and then we have situations that are badly handled and the current social instability all over the place.
Imo, harmony comes from respect, to have respect we have to acknowledge differences first and foremost, to ignore them is what creates conflict, as there is no basis for respect.
Edit: adding some sources, as what i just said probably goes against the general meme.
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2867623/
http://www.ncb.org.uk/news/challenge...n-the-uk-today
http://www.ncbi.nlm.nih.gov/pubmed/15994621
http://www.ncbi.nlm.nih.gov/pubmed/22776059
https://upload.wikimedia.org/wikiped...Denisovans.jpg
http://www.ncb.org.uk/news/challenge...n-the-uk-today
http://www.nature.com/scitable/topic...e-and-race-744
http://www.physanth.org/about/positi...-aspects-race/
http://www.ncbi.nlm.nih.gov/pubmed/11172830
There is tons of information out there, people just refuse to see, they think that pretending everyone is the same will solve problems, imo, its whats causing a lot of them.