Though I suppose if you draw arbitrarily you arent showing preference which makes it fair. If not the best outcome.
I tend to say no, if we are going to stay a constitutional republic then whole idea is to have elected officials govern within the confines of a constitution. And no where in those confines is the idea that to represent a district one has to demographically match the constituents by race, or by age, or by sex, or by income level, etc. If it were otherwise we would already see stronger elements of racial segregation today and the make up of Congress would more match the racial demographic make up of the US. Right now we have roughly 12.6% of the nation that is black, roughly 8.9% of the 114th Congress is black. They still do not add up, but still I am unsure that means that Congress cannot be reflective of the will of the people because of that roughly 3.7 point gap for the black population. I am sure though that we have plenty of black voters that feel otherwise and it gives us this problem of what to, Constitutionally, to ensure outcome.
These are the reasons I initially answered the thread with there is no such thing as justified racial discrimination, even if the tables were flipped and 15% of Congress was black with the same 12.6% of the population being black I doubt that alone means a higher degree of political goals obtained. I mean think about it, we have now had a two term black president and by demographics and economic data blacks are worse off now than before, and in just about all categories blacks lag behind whites when it comes to unemployment, labor participation, movement up the income quintiles, education, etc. When it comes to the percentage of Americans on one or more forms of government assistance (social safety nets) the results are just as bad when broken down by racial lines.
In this case I have little choice but to suggest the argument for justified racial discrimination by default means continuing to go with very specific representative district lines and eventually involve segregation to effect representative outcome. That further illustrates the political window dressing today's representatives have given us with this effort to ensure political outcome. So now we get to evolve past today's politics being all about treasury promises, we get to include manufactured results for office but little results for those that elected them.
"Every time something really bad happens, people cry out for safety, and the government answers by taking rights away from good people." - Penn Jillette.