Because you will have ugly children.
The one-drop rule has a wholesome basis in instinctual feeling. It’s not a question of whether this or that octoroon can “pass”; it’s a question of, granting the obvious diversity of early hominid species and their respective contributions to present “mankind”, why would you want to screw up with a heritage purified by an Ice Age by dumping back into it some completely unfiltered ape blood from Africa?
— Lucius Somesuch
I think there’s a resurgence of traditionalism because at this point in time Whites are learning to reject multiculturalism, and I think the Alt-Right is part of the throes of that transformation, which must take place. Europe is not going to be the multiracial societies that they have become over the recent decades. The Alt-Right is at the center of that. It’s a huge transformation for Europe to make. Whites are now going into purification mode, and nationalists are resented because of their leading role. But without that leading role, and without that transformation, Europe will not survive.