Failing to protect the weak, letting them be slaughtered by demon beasts, is already the fault of the human race cultivators.
Being domesticated, needing to use labor to support cultivators, the lifespan of mere mortals is very short, born like duckweed, never having had the ruling power over the world, naturally having no thought of defending it.
They settle down wherever they drift, the ruler is unimportant, as long as they can live comfortably that's enough.
As for descendants continuously intermarrying with Otherworld human race, even if some become cultivators, they merely accept the current world's principles. The history of ancestors migrating has long been extinguished in the river of time, no one cares.
Xuanyuan Yang Guang searched for many years, returning with no one behind him.
He fought tirelessly, giving everything, but was even turned away by his own kin. Thus, with all thoughts extinguished, he went to close his life-or-death retreat, never to reappear.
