There is strong opposition to Paul in Thessalonica because of the power of Paul's message. The Jewish leaders had been afraid of the power of Christ's message which led to his crucifixion. If Paul leads the people to convert to Christianity, the Jewish leaders will lose some of their power and the financial backing.
Paul continues to preach despite the risks involved because that is what Christians are expected to do. Paul understands that the risks of persecution do not outweigh the heavenly prize awaiting him. We should not fear death if we are right with God.
Violent reaction to Christian ministry should not stop Christians from preaching the Word. If Christians are afraid to spread the message, or back down from the principles of Christ's teaching, the faith will wither away. Therefore, all Christians should stand up, unafraid and tell it like it is.
