The reason people who are Euro nationalist focus on IQ is that its all they have to show for biological differences now that Darwinian theory is dead. But of course there is no gene in the body that have been found that determines the IQ a person has. But that's all they have.Of course that is not why people like myself discuss - not "focus on" - IQ. Nationalism has no necessary connection with human biological differences. If I had to reduce to pithiness the reasons for discussing IQ, other than from purely scientific interest, it is because I live in a multiracial society whose leaders demonize whites for the failures of non-whites. (Note that whites get no credit for the success of some non-white groups, notably Asians.) Mohamed has, I assume, the luxury of living in a monoracial society.
The problem is that these Nationalist don't know how to promote their ethnic identity without some form of superiority. Ethnic nationalism exist all over the world. But rarely do you see any attempt to focus on IQ. Chinese and orientals have ON AVERAGE higher IQs that Europeans. But when is the last time you hears Chinese talk about such things?Every ethnic group has historical and religious myths that confer legitimacy and pride on that group. However, in the case of "Euro nationalists", in my opinion an objective observer would have to conclude that European civilization, broadly construed, has been the wonder of the world. Nevertheless, the Euro nationalist case does not rest on objective superiority, any more than a Ghanaian or Pakistani nationalist need base his case on superiority. Europeans and their descendants can be justifiably proud of the achievements of their ancestors, and this lies in the realm of historical and national myths; not myths in the sense of being fictional, but in the sense of stories that people tell themselves. Ghanaians and Pakistanis have stories that they tell themselves too, and I've never heard of a Euro nationalist who wants to deprive them of their stories or their nationalism.
Objectively, we can talk about superiority and inferiority. Reality doesn't care what we think. Subjectively, nationalism requires that individuals consider themselves part of a larger group, usually united by a common language, ancestry, and geography, but usually with the added element of some form of superiority, a sort of national positive self-talk.
Ethnic identity and similar features and cultures are normal. But supremacy is not.As noted, national myths usually involve some form of why the members of the nation are superior in some way, whether in valor, or having a correct view of the world, or even the greatness of their literature. That they are superior in their own eyes speaks to the justice of deserving their own nation. But it's normally difficult to convince others of the superiority of a nation to which they don't belong. Hence the confusion about supremacy.

