I'm a Mormon though not from Utah.
You still need to understand the Mormon culture and church more so. I'm not sure what you mean by being excluded (Excommunicated, shunned, offended?) isn't absolute, in fact, no one really is excluded from the church as all are forever welcome (Some extreme edge cases aside) back. This is in an ideal situation and I know that in some locations that maybe a local leader or some local members because of lack of experience, their own mistakes or whatever don't truly welcome and help someone return. I'm also curious what are some of the minor infractions that were induce someone being excluded from the Mormon community..
Not all Mormons hide everything from their family, friends and leaders. We're encouraged to do the opposite, actually, in appropriateness and relativeness especially so when it's something quite bad which are the things someone would be blackmailed about. You wouldn't go blackmailing someone because he didn't read the Ensign every month which is something a Mormon probably wouldn't really bother telling anyone.
Also, someone who is a Mormon probably has fewer things to be blackmailed about—lewd pictures, drunken mistakes, egregious offenses to others and the law, hidden relationships (Sexual or otherwise), etc. are not things we seek out, instead, we actively avoid those things and not only actions but locations (Bars, night clubs, etc.) where more embarrassing/illegal things tend to happen. This is based on what I've seen and learnt throughout my life and I'm not pretending that these are any great or completely accurate comments, simply some postulations.