Let's summarize this material in this manner. God's commandment is for his Christian children to love each other. The spiritual ideal is to create and maintain close, real, loving relationships as brothers and sisters. In many of our relationships, we can work toward that ideal. In relationships which have been distressed by wrong doing or by misconduct, in love we seek to get the person to accept his responsibility, repent, and restore his relationship with God and his spiritual family.
Many different reasons can create such situations.
At any given moment there are all levels of spiritual development in the congregation. There will be different understandings of right and wrong, good and bad, and the proper way of doing things. It is possible for two sincere Christians to hold such different opinions and judgments that they are in frequent conflict, and they have a hard time working together and relating. There are all kinds of personalities and cultural backgrounds in a congregation. Some Christians have very strong personalities, and they don't follow easily.