I can't speak for anyone else, but I hate seeing someone's name drug through the mud when there's no evidence that he's done anything to deserve it. My biggest problem with allowing RL to be sleuthed is that too many people seem to have a hard time separating sleuthing and accusing. I even feel bad for asking to allow discussions of JW now, and he has been arrested for child molestation.
I know many, if not most, here like to come up with full blown theories, which would include a perpetrator, a motive, a cause of death, and often a lot of gruesome details. I prefer to come up with ideas about what may have led up to it, the type of person who might commit the crime, what makes the crime scene desirable for a specific crime (or perp), what may have allowed him/her/them to escape afterwards, etc. I just hate to think I'm contributing to ruining someone's life when they don't deserve it. Because of that, I don't like posting about someone LE hasn't publicly named, no matter what info I find while sleuthing.
I'm sure others have different reasons, but FWIW that's mine.