Not true, actually. If you have a HIGHLY contagious disease, everybody eventually gets it regardless - see chickenpox before there was a vaccine. Quarantine of INFECTED makes sense if the disease is infectious, has fairly lethality, but not HIGHLY contagious - see smallpox before vaccinations.

But quarantining the vast bulk of uninflected so they don’t get a disease has never really worked. Or if it You believe it has, please cite me a case where it did.