The church should be sanctified, to be set apart for the purpose of worshipping God and learning about Him. We are given instructions on how to handle a case of immorality in the church, something that a sanctified church could not have within its ranks. It would no longer be a sanctified, unified body dedicated only to serving and worshiping the Lord.
Yet we are told we must tolerate it, because one of the missions of the church is evangelism. We are each told to evangelize, but that is not what the church is set aside to do. We are told we must love homos as God loves them, and that is true, but it is not loving them to let them be part of a sanctified church so that church is no longer sanctified.