I'm not using the "well, this sucks" icon for this reason, as quoted by Patrick Nielsen Hayden on Making Light:
The central question that emerges…is whether the White community in the South is entitled to take such measures as are necessary to prevail, politically and culturally, in areas where it does not predominate numerically? The sobering answer is Yes--the White community is so entitled because, for the time being, it is the advanced race.
Buckley said that in 1957 in the National Review. I don't see any good reason to give him a pass because he was an eloquent speaker and a talented writer.