Conversation so far:
What happened to Medgar Evers?
Medgar Evers was assassinated in 1963 by Byron De La Beckwith, a member of the White Citizens' Council in Jackson, Mississippi.
Who normally was there for Medgar Evers?
What happened the day Medgar Evers died?
Medgar Evers and his wife Myrlie had trained their children on what to do in case of a shooting, bombing or other kind of attack on their lives.
What had Medgar Evers and his wife Myrlie trained their children for before the day of his assassination?
Medgar Evers arrived at his home on the morning of his death without an escort. None of his usual protection was present.

Question: Why do people think the protection was gone?
Self-contained rewrite: Why do people think Medgar Evers' usual protection was gone?