There’s not much to it. They simply believe that as the strife causes conflict over resources the factions will “naturally” align along racial lines. They also believe that people “naturally” cohabitate better within their own race.

This does require ignoring all of human history and the brutal conflicts that have occurred within racially homogenous regions. But I’d never accuse white supremacists of being intelligent or genuine.

I wouldn’t recommend this if you fly very frequently, but you can take some ibuprofen or acetaminophen at the start of the flight / part way though and it should be active around the time you start getting sore.