Excommunication is a man-mad doctrine. Jesus didn't turn out anyone. He ate with the whores, fishermen and tax collectors. I would assume he would also sup with Joseph Smith, Brigham Young or Gordon B. Hinckley. But He never told us that these men were the only spokesman for Him in all things during their dispensation either. That teaching is unbiblical.
The Bible warns us about false Prophets. We are to judge them according to scripture (and not scripture that they pull out of a hat either). These men do not fit. It is as simple as that. I don't judge them based upon their sin or lack of sin. I base my judgement on the word of God, and so should you.
What most people don’t realize about excommunication is that it is designed to be part of the repentance process. In many cases, it works.
Here are just a few Biblical examples of the concept of excommunication - enough to convince me that it is NOT a man-made doctrine.
Ex. 12: 15 eateth leavened bread . . . shall be cut off.
Lev. 7: 21 touch unclean thing . . . shall be cut off.
Lev. 18: 29 (Lev. 18: 6-30) commit any of these abominations . . . shall be cut off.
Lev. 20: 6 turneth after . . . familiar spirits . . . cut him off.
Num. 15: 30 soul that doth ought presumptuously . . . shall be cut off.
Num. 19: 13 defileth the tabernacle . . . shall be cut off.
Ezra 2: 62 polluted, put from the priesthood.
Mal. 2: 12 Lord will cut off the man that doeth this.
Gal. 5: 12 cut off which trouble you.
2 Thes. 3: 6 withdraw yourselves from every brother that walketh disorderly.
Reference: http://scriptures.lds.org/en/tg/e/129
All I know is that I try to follow Christ’s advice, to forgive seventy times seven, and then do it again. However, I also realize that no unclean thing can enter into the presence of God, and that some sins are grave enough that discipline is the route that must be taken. I know of several people who are close to me who have been disfellowshipped or excommunicated. I’m not their judge, Christ is. A couple repented of their sins and are in full fellowship in the church once again. My friendship and love is not conditional upon status or membership in the Church of Jesus Christ of Latter-Day Saints.