American citizens blocked from entering their own country

American citizens and permanent residents evacuated from Afghanistan not allowed entry into the US.
What is the deeper meaning of that?

References

Biden Admin Bars Evacuation Flight with Americans on Board from Landing in US, DHS Official Responds

Biden Administration Blocks Evacuation Flight with American Citizens on Board from Landing in the U.S.

Special Immigrant Visas for Afghans - Who Were Employed by/on Behalf of the U.S. Government

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