"National control" (in other words, national socialism) and other forms of totalitarianism or authoritarianism are both wrong and evil because they infringes on the inalienable rights of the individual to life, to liberty, and to the pursuit of happiness.
Frankly, I find disgusting and repugnant your opinion that somehow "national control over issues like ethnicity" is not at all evil. One need only look to the Soviet gulags, the Nazi ovens, Japanese' treatment of WWII Allied POWs, and to the internment camps, Jim Crow laws, and eugenics of the United States...and to all the other "national control" ethnicity experiments of the twentieth century to see that it is evil.
Ping to post 17.