Church discipline is actually an act of grace. Church discipline actually starts on the individual Christian level when one brother goes to another brother and lovingly confronts them. Often times the issue is dealt with and ends there. We are used to thinking of church discipline when it escalates up to the elders, the pastor, and then to the entire congregation. It is grace and love for the individual that is the motivation behind church discipline:
James 5:19-20 19 My brethren, if any among you strays from the truth and one turns him back, 20 let him know that he who turns a sinner from the error of his way will save his soul from death and will cover a multitude of sins.
Failure to practice biblical church discipline is actually a sign that a church lacks love and care for its members. Is a member living in adultery? So what? A public drunkard and wife beater? Not my problem. Teaching heresy in a bible study? Hear no evil, see no evil. Lying and/or gossiping about others in the church? Not a problem, so long as it is not about me.
Are their abuses in exercising church discipline? Of course! However, abuses do not nullify the thing itself, they only impugn the abuser.