Well, I consider myself more than "halfway-intelligent," and I'm not convinced that he was guilty of murder. I do think that he knows what happened, but I still believe that it was his son who committed the murders, and OJ helped cover it up. Beyond that, I don't want to derail this thread too far, so I won't spend much more time talking about this here.
I read about that theory, and from what I read it's pretty compelling. I do wonder, though, if there are reasons why no one ever tried to build a case against him, beyond "we know OJ did it, so there's no reason to look at any one else."