Schopenhauer isn’t describing a concept that can be “applied.”
He’s describing a human reflex:
when someone has no reason left to be proud of themselves, pride shifts to origin, nation, or ethnicity.
No one decides this — it happens automatically.
Discussion
No it doesn't. That return to origin happens when people are proud of themselves. Infact the first sign of decadence is exactly the loss of identity, when people have nothing to be proud of. Many of the modern philosophers had a very strong policial bias and put the seeds for the corruption of entire nations with success. We should start understanding the goals of those people analyzing what secret societies they were part of. Many things will be clear after.