Deviant doctrines are elsewhere characterized as cancer or leaven, such as in 2Tim 2:16,17 "shun profane and idle babblings, for they will increase to more ungodliness. And their message will spread like cancer", and in Galatians concerning the doctrine of the circumcision he says, "A little leaven leavens the whole lump." To just leave them alone is to invite further corruption of the Christian community. And so the Bible instructs first of all to identify them and then to purge or otherwise isolate them, much as that process itself will inevitably invite conflict. But that kind of conflict is characteristic of Jesus and Paul's ministry, and so the Christian need not shy away from it.