Those who recognize that the thread to most populations is genetic destruction by outbreeding tend to support nationalism, or the idea that the nation is defined by a single ethnic group. This conflicts with the egalitarian ideals that have been de rigueur for the past two centuries.
Currently, the egalitarians are attacking Israel for deporting genetically dissimilar people in an attempt to preserve the genetics of the Jewish people:
Jonathan Greenblatt, the CEO of the Anti-Defamation League, likened African migrants in Israel to the “Dreamers” at the heart of a contentious US immigration debate and suggested that deporting them would make Israel appear racist.
…Greenblatt has joined calls on Israel not to deport the African migrants, but casting the call in terms that suggested that it would look racist is an escalation of the debate.
…Much of the organized Jewish community, including the ADL, has lined up with Democrats and immigration advocates who call for removing the threat of deportation of the Dreamers.
While European and Eastern European Jewish migrants are ethnically similar to Ashkenazi and Sephardic Jews, African migrants are entirely different and their arrival will shatter the majority unity needed in order to preserve the cultural identity that protects the genetics of the Jewish people.
If the ADL were thinking clearly, it would see that its primary mission is not to fit in with political trends, but to protect the Jewish people against those trends by preserving their rights to autonomy and exclusion.