And in your opinion, wizanda, why is Mormonism an "extremist cult"? Let's talk about it, okay?
Mormonism is not an 'extremist cult' and except for when it was first being formed, never has been, under the common understanding of that term.
I notice that one link was to the 'excommunication' section of an anti-Mormon site (I call it anti-Mormon because it gets some rather important facts wrong...like the excommunication of J. Michael Quinn...and doesn't bother to correct them). Notice the reasons for excommunication: abortion, transsexual operation, attempted murder, rape, forcible sexual abuse, intentionally inflicting serious physical injuries on others, adultery, fornication, homosexual relations, child abuse (sexual or physical), spouse abuse, deliberate abandonment of family responsibilities, robbery, burglary, theft, sale of illegal drugs, fraud, perjury, or false swearing.
Please note; all these things are matters of deliberate choices, of wrongful and hurtful actions. BEING a homosexual, for instance, is not on the list. Simply having different opinions regarding the teachings of the church is not on the list. In order to be an apostate, one must actively teach against church beliefs; publish articles and/or books denouncing the teachings of the church as wrong. THAT is why the 'September six' went. I mean, really....if one doesn't believe that the church one belongs to teaches the correct things, then why is one a member?
As for Quinn, HE was excommunicated because he committed adultery; he left his wife and children and went with his gay lover. It had nothing to do with what he wrote, which (I've read the book y'all think got him 'ex'd'...blech) and that didn't do it. However, adultery will do it every time.
Now here's the thing about excommunication and the CoJCoLDS: excommunication is a 'second chance.' We do NOT shun excommunicated members. Quite the opposite. We are SUPPOSED to love, support and help them, whether they choose to come back or not. "Shunning" is not something Latter-day saints do. Family is more important. It's done TO us all the time, but we aren't supposed to DO it to anybody.
It is true that individual situations alter cases; I know a certain orthodontist in town who left his wife and eight children to have an affair with his office whatever she was. He refused to pay child support. He was, and remains, a complete jerk (he's on his third wife). His first wife has had to take him to court many times in the past few years, until their youngest finally graduated high school. None of them became dentists, btw, and I can certainly understand why neither she, nor any of her friends, had anything to do with him. Not because he'd messed with Mormonism, but because he was such a dirtwad to HER.
Absent this level of jerkdom, however, 'shunning' is not supposed to happen. Rebaptism after excommunication is the one time when the 'sinner' can be assured (in our beliefs) that ALL sins are forgiven. S/he can stop blaming him/herself, and be free of guilt. It's a good thing.
One chooses to belong to a group because one admires the ethics, the morals and the rules abided by that group. If you want to talk about behavior modification, etc., try joining the army and deciding that you don't feel like obeying an order that day.