Strong families focused on increasing the defense at their own shelters and didn't dare to leave as they were afraid more asuras might attack their base if they went to support.
Seven silver sword families didn't even bother thinking about it as all their shelters were in the corrupted lands.
The human warriors around the human countries on earth were told to report to their yellow stage shelters immediately to protect each of their bases.
In the end, the government gave up on looking for a viable solution as It was only a little portion of yellow stage shelters in the land of Asura that was located at the border of the Shamor Empire.
There were a great number of Yellow-Stage shelters in the corrupted land that they could focus on.
Additionally, the demon lord of Asura wasn't even killing anyone which just assisted in the decision to shut their eyes to all of these incidents.