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Excommunication is a way of branding someone as ‘sinful,’ untrustworthy, or dishonest.

So adultery or murder is not cause for excommunication from a church? Because they will be labeled as sinners? Hmmm. So you would have problems with the National Association of Evangelicals, an umbrella group representing more than 45,000 churches with 30 million members. Also, New Life Church, where Haggard was the pastor (he started the church in his basement.)

I Corinthians 5:4-5 says, "In the name of our Lord Jesus Christ, when you are gathered together, along with my spirit, with the power of our Lord Jesus Christ, deliver such a one to Satan for the destruction of the flesh, that his spirit may be saved in the day of the Lord Jesus." The purpose of excommunication is to save the person from his uncleanness that is destroying his communion with God and others in the fellowship. Therefore, if he can still be saved, that person is not completely cut off from God. Bible Tools.org

And from Church discipline

Question: "What does the Bible say about church discipline / excommunication?"
Answer: Excommunication is the formal removal of an individual from church membership roles and the informal separation of company from that individual. Matthew 18:15-20 gives the procedure and authority for a church to do this. It instructs us that one individual (usually the offended party) is to go to the offending individual. If he/she does not repent, then two or three go to confirm the situation and the refusal to repent. If there is still no repentance, it is taken before the church. This process is never "desirable," just as a parent never delights in having to discipline his/her children. Often, though, it is necessary. The purpose is not to be mean spirited or to display a "holier than thou" attitude. Rather, it is to be done in love toward the individual, in obedience and honor to God, and in godly fear for the sake of others in the church.
The Bible gives an example of the necessity of excommunication in a local church, the church at the city of Corinth (1 Corinthians 5:1-13). In this passage, the apostle Paul also gives some purposes behind the biblical use of excommunication. One reason (not directly found in the passage) is for the sake of the testimony of Christ Jesus (and His church) before the unbelievers. When David had sinned with Bathsheba, one of the consequences of his sin that God mentions is that the name of the one true God will be blasphemed by God's enemies (2 Samuel 12:14). A second reason is that sin is like a cancer; if allowed to exist, it spreads to those nearby just as a little yeast leavens a whole loaf of bread (1 Corinthians 5:6-7). Also, Paul explains that Jesus saved us so that we might be set apart from sin, that we might be "unleavened" or free from that which decays spiritually (1 Corinthians 5:7-8). Christ's desire for His bride, the Church, is that she might be pure and undefiled (Ephesians 5:25-27). Excommunication is also for the long-term welfare of the one being disciplined by the church. Paul, in 1 Corinthians 5:5, states that excommunication is a way of delivering "such a one to Satan for the destruction of the flesh, that his spirit may be saved in the day of the Lord Jesus." This means that excommunication can somehow involve God using Satan (or one of his demons) as a disciplinary tool to work in the sinner's life physically to bring about true repentance in his/her heart.
Sometimes the disciplinary action of the church is successful in bringing about godly sorrow and true repentance. When this occurs, the individual is able to be restored to fellowship. The individual involved in the 1 Corinthians 5 passage repented, and Paul encouraged the church to restore him to fellowship with the church (2 Corinthians 2:5-8). Unfortunately, the disciplinary action, even when done in love and in the correct manner, is not always successful in bringing about such restoration, but is still needed to accomplish the other good purposes mentioned above.
We have all likely witnessed the behavior of a child who has been allowed to do as he/she pleases with no or very little consistent discipline. It is not a pretty sight! Nor is such parenting loving for it dooms the child to a dismal future. Such behavior will keep the child from forming meaningful relationships and performing well in any kind of a setting, whether socially or in an occupation. In a like manner, discipline in the church setting, while neither enjoyable nor easy, is not only necessary, but loving as well. Moreover, it is commanded by God.

Matthew 18:15-17 says:

15 ¶ Moreover if thy brother shall trespass against thee, go and tell him his fault between thee and him alone: if he shall hear thee, thou hast gained thy brother.
16 But if he will not hear thee, then take with thee one or two more, that in the mouth of two or three witnesses every word may be established.
17 And if he shall neglect to hear them, tell it unto the church: but if he neglect to hear the church, let him be unto thee as an heathen man and a publican.

Would that you could apply this to the truth about Joseph Smith. But, even so, we are admonished to judge and keep the fellowship of believers from becoming just like the world. If we do not cleanse our midst, we are held accountable before the Lord! And we are certainly not doing the 'brother' any favor by allowing the continued degeneracy while in our fellowship. It is interesting that Paul teaches even this man who 'married' his own mother may be devoured by Satan yet saved in the Day of the Lord Jesus. Very Baptist, that! [Once saved always saved ...]

I Cor 5:9 I wrote unto you in an epistle not to company with fornicators:

10 Yet not altogether with the fornicators of this world, or with the covetous, or extortioners, or with idolaters; for then must ye needs go out of the world.

11 But now I have written unto you not to keep company, if any man that is called a brother be a fornicator, or covetous, or an idolater, or a railer, or a drunkard, or an extortioner; with such an one no not to eat.

12 For what have I to do to judge them also that are without? do not ye judge them that are within?

13 But them that are without God judgeth. Therefore put away from among yourselves that wicked person.