Why did the puritans establish their own church and persecute dissenters?

The Puritans established their own church in order to practice their beliefs according to their interpretation of The Bible without interference from the Church of England. They persecuted dissenters because they viewed any deviation from their beliefs as a threat to their community and to their religious and moral values. They believed in a strict adherence to their interpretation of Christianity and saw dissenters as potential sources of corruption.