Same reason as in the Gospels. The religious leadership acted as gatekeepers, preventing others from getting in so that they could have power over them. They were corrupt, and Jesus was a threat because he acted with God’s true authority, yet didn’t prevent others from coming to God.
How do we explain, then, that the first followers of Christ were mostly Jews?
The video seems to put all the blame on a venal religious establishment, ignoring that there were far more complex reasons why more Jews - many of whom certainly had minds that were just as independent as those of Jesus’ followers were - DIDN’T follow Him.