Actually, my broader point is that there's substancial indeterminacy to the legal system and that society uses this wiggle room to dole out mob justice.
That may be true, but I don't see how it's relevant to OJ. He wasn't lynched or set up; he committed a crime and went to prison for it. I don't see how that's mob justice even if some people were happy about it.
This is me being an armchair "bird lawyer" without actual expertise, but it seems to me that his threatening people with a gun for them to stay in a room for a few minutes while he searched the place for the goods they thought stolen from him...
... well, it's not good. But is it kidnapping? My common sense tells me by then the system was biased against him. Mob justice, therefore, even if not from a wild, tar-and-feather variety.