The crowd that followed kept shouting, “Get rid of him!”

Acts 21:27-40
When the seven days were nearly over, some Jews from the province of Asia saw Paul at the temple. They stirred up the whole crowd and seized him,  shouting, “Fellow Israelites, help us! This is the man who teaches everyone everywhere against our people and our law and this place. And besides, he has brought Greeks into the temple and defiled this holy place.”
The commander came up and arrested him and ordered him to be bound with two chains. Then he asked who he was and what he had done. When Paul reached the steps, the violence of the mob was so great he had to be carried by the soldiers. The crowd that followed kept shouting, “Get rid of him!”
After receiving the commander’s permission, Paul stood on the steps and motioned to the crowd. When they were all silent, he said to them in Aramaic.
But garbled tales are circulating, that Paul teaches Jews to abandon  circumcision and the law. If he openly identifies with a group of men under a strict vow all will see that he respects and observes the law. But before the week-long term of the vow is over, a group of conservative Jews from the province of Asia create such a ferment that soldiers from the fort step in to prevent a lynching. 
Why?
People heard some Jews from the province of Asia, they heard that Paul is against their law and defiled the holy place, so they were got together the shouted Get rid of him. People are blind.
Under commander's permission, Paul stood on the steps and may said to the crowd.
Paul knew he will face dangerous but he still come back to Jerusalem, for he knows his life is on the hand of the Lord, so he does not afraid, and he has opportunity to said to public and other higher officers.
This situation is like Jesus be seized before going to the cross.
How?
Paul knew what is doing so he did not afraid, I know what I am trust in so I do not afraid either.