Discipline within the church is counter-cultural today, but without loving correction the church will only resemble the world around it. In chapter 5 Paul actually disciplines the church in Corinth for not disciplining the man living in public, ongoing, unrepentant sexual sin. The collateral damage of public and unrepentant sin within the church body defaces the glory of Christ and his gospel, corrupts others in the congregation who struggle with maintaining purity, and places the sinner in spiritual peril by tacitly accepting--or celebrating--their sin. The church is holy, the temple of the Holy Spirit, and godly discipline along with obedience to God's word helps deepen purity and Christ-likeness in his church.
https://stjohnsrichmond.ca/wp-content/uploads/2016/03/SE2013Oct27-2.mp3