It is God’s will that we are made holy only through Christ’s work on the cross. (John 3:14).
He died one time for all men. He bore the sins of all men.
What defense could be offered for that multitude of sin
The effect of the earthly priest’s work was temporary.
Hebrews 10:1-4: The sacrificial system only covered the sin. They had to be offered again and again and again.